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committerRoger Frank <rfrank@pglaf.org>2025-10-15 04:49:04 -0700
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+The Project Gutenberg EBook of 1001 tasks for mental calculation
+by Sergej Aleksandrovich Rachinskij
+
+This eBook is for the use of anyone anywhere at no cost and with
+almost no restrictions whatsoever. You may copy it, give it away or
+re-use it under the terms of the Project Gutenberg License included
+with this eBook or online at www.gutenberg.org
+
+
+Title: 1001 tasks for mental calculation
+
+Author: Sergej Aleksandrovich Rachinskij
+
+Release Date: August 14, 2005 [EBook #16527]
+
+Language: Russian
+
+Character set encoding: CP-1251
+
+*** START OF THIS PROJECT GUTENBERG EBOOK 1001 TASKS FOR MENTAL CALCULATION ***
+
+
+
+
+-
+
+
+
+
+
+... 1001
+
+ : .. " ..
+ ." ., , 2003
+
+ . . 1001
+ ,
+ . (1899)
+ .
+ , .
+
+ . . ,
+, .. 365 ,
+ .
+ . .
+ . , 480 .
+ .
+
+1. . 36
+ . ? [1008]
+
+2. 11 23 . 13 19 .
+? [500 .]
+
+3. 18 18 . 12 23 .
+? [600 .]
+
+4. 13 39 . 17 29 .
+? [1000 .]
+
+5. 16 97 . 26 48 .
+ ? [2800 .]
+
+6. 31 32 . 28 36 .
+ ? [2000 .]
+
+7. 37 37. 11 21 .
+? [1600 .]
+
+8. 14 . ?
+[5110]
+
+9. 32 , 31 . 25 .
+ ? [1000 .]
+
+10. 375 ? [6000]
+
+11. 100 . 16 . ? [6 .
+25 .]
+
+12. 60 . 16 . ? [3 . 75
+.]
+
+13. 150 . 120 . ? [1
+. 25 .]
+
+14. 40 . . ? [146 .]
+
+15. 10 . 31 18 . 34 .
+ ? [13 .]
+
+16. 29 31 . 9 89 .
+ ? [1700 .]
+
+17. 3 .
+ 1 . ? [43 .]
+
+18. 7 . 1 ., 10
+. ? [1 . 43 .]
+
+19. 20 . 32 48 . 16 .
+ ? [29 .]
+
+20. 5 . 12 19 . 16 .
+ ? [17 .]
+
+21. 60 . . ? [219 .]
+
+22. 900 . 19 19 . 7
+. ? [77 .]
+
+23. 9 . 21 21 . 17 .
+ ? [27 .]
+
+24. 20 . 63 27 . 23 .
+ ? [13 .]
+
+25. , ? [1440; 10080]
+
+26. ? ? [1280; 3840]
+
+27. ? ? [24000; 42000]
+
+28. 19 24 . 17 .
+ 1000 . ? [32 .]
+
+29. ( ) ? [8760]
+
+30. 15 . 79 ,
+ . ? [19 .]
+
+31. 69 . 20 .,
+1 . ? [29 .]
+
+32. 2 2 2 . ? [130]
+
+33. 961 .
+ ? [31]
+
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+
+35. 7 7 7 . ? [511]
+
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+
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+
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+
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+
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+
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+ ? [20 .]
+
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+ ? [10 .]
+
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+
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+ 5 ., 15 .
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+
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+
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+
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+]
+
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+ 28 . 5 . 40 .
+ 100 ? [ , ]
+
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+
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+? [6]
+
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+. 30 . ? []
+
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+
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+ 12 . ,
+ 27 . ? [ 70 .]
+
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+ 20 . ? [140 .]
+
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+ 4 . ? [30 .]
+
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+ 1 . 20 ., 15 .
+ ? []
+
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+ 37 . ? [2 . ]
+
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+ 69 . ? [1 .]
+
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+ 80 . 2 . 10 . ?
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+
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+ 3 . 40 250 .
+ . ? [15 .]
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+
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+
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+ 7 , 8 ; 9
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+
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+ 15 240
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+
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+
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+ . ? I [19 .; 38 .; 76
+.]
+
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+ . ? [17 .; 51 .; 1 . 53 .]
+
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+
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+
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+
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+
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+
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+ ; . ? [8 .; 32
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+
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+
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+
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+ ; 300 .
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+ 63 . 15 .,
+ 12 . ? [ 7 ]
+
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+
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+ 2000 . ? [77.]
+
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+
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+ 1000 ? [25 ]
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+ ? [40 000]
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+
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+ 41 .; . ? [48 .]
+
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+
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+
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+ 150 . ? [300 .]
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+ 800 .? [5]
+
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+
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+ 12 ? [468]
+
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+
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+
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+
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+
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+45. ? [ 20 ]
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+ 6 , 8 ? [240]
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+ , 240
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+ ? [19 .]
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+ 148 . 15 .
+? [80 .]
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+ ? [35 .; 15 .]
+
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+? [6 .; 3 .]
+
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+ 15 , 10 , 6 .
+ ? [ 3 ]
+
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+ 25 ., , .
+ ? [105; 135 .]
+
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+, 24 , 16 .
+ ? [ 8 ]
+
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+ (480 ). : 96 ,
+120 , 160 .
+ 3 ? [ 40 ]
+
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+ 5, 4 .
+, ,
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+
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+ 24 ., 20 ., 16 .
+ ? [20]
+
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+ ? [54 . 60 .]
+
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+ , 1000 . ? [25
+.]
+
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+ 400 ( 3 .).
+, 120 .? [ 1 . 50 .]
+
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+ 90 450 . 8
+. , 100 .
+? [ 45 .]
+
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+
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+
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+ 2 5 . ? [27]
+
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+. , 150 .
+ ? [500 .]
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+1001. 8 , 4 ,
+1 1 8 . 1
+. 50 . ? [72 .]
+
+
+
+
+
+
+
+
+End of the Project Gutenberg EBook of 1001 tasks for mental calculation
+by Sergej Aleksandrovich Rachinskij
+
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@@ -0,0 +1,1441 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
+<HTML>
+<HEAD>
+<TITLE>... 1001 </TITLE>
+<META HTTP-EQUIV="CONTENT-TYPE" CONTENT="TEXT/HTML; CHARSET=WINDOWS-1251">
+</HEAD>
+
+<BODY>
+
+
+<pre>
+
+The Project Gutenberg EBook of 1001 tasks for mental calculation
+by Sergej Aleksandrovich Rachinskij
+
+This eBook is for the use of anyone anywhere at no cost and with
+almost no restrictions whatsoever. You may copy it, give it away or
+re-use it under the terms of the Project Gutenberg License included
+with this eBook or online at www.gutenberg.org
+
+
+Title: 1001 tasks for mental calculation
+
+Author: Sergej Aleksandrovich Rachinskij
+
+Release Date: August 14, 2005 [EBook #16527]
+
+Language: Russian
+
+Character set encoding: CP-1251
+
+*** START OF THIS PROJECT GUTENBERG EBOOK 1001 TASKS FOR MENTAL CALCULATION ***
+
+
+
+
+-
+
+
+
+
+
+</pre>
+
+<p>
+ : .. " .. ." ., , 2003
+</p>
+<p> &nbsp;</p>
+<p>
+ . . 1001 , .
+ (1899) . ,
+ .
+</p>
+<p>
+ . . , , .. 365 ,
+ . . .
+. , 480 . .
+</p>
+<p> 1. . 36 . ? [1008]</p>
+<p> 2. 11 23 . 13 19 . ? [500 .]</p>
+<p> 3. 18 18 . 12 23 . ? [600 .]</p>
+<p> 4. 13 39 . 17 29 . ? [1000 .]</p>
+<p> 5. 16 97 . 26 48 . ? [2800 .]</p>
+<p> 6. 31 32 . 28 36 . ? [2000 .]</p>
+<p> 7. 37 37. 11 21 . ? [1600 .]</p>
+<p> 8. 14 . ? [5110]</p>
+<p> 9. 32 , 31 . 25 . ? [1000 .]</p>
+<p> 10. 375 ? [6000]</p>
+<p> 11. 100 . 16 . ? [6 . 25 .]</p>
+<p> 12. 60 . 16 . ? [3 . 75 .]</p>
+<p> 13. 150 . 120 . ? [1 . 25 .]</p>
+<p> 14. 40 . . ? [146 .]</p>
+<p> 15. 10 . 31 18 . 34 . ? [13 .]</p>
+<p> 16. 29 31 . 9 89 . ? [1700 .]</p>
+<p> 17. 3 . 1 . ? [43 .]</p>
+<p> 18. 7 . 1 ., 10 . ? [1 . 43 .]</p>
+<p> 19. 20 . 32 48 . 16 . ? [29 .]</p>
+<p> 20. 5 . 12 19 . 16 . ? [17 .]</p>
+<p> 21. 60 . . ? [219 .]</p>
+<p> 22. 900 . 19 19 . 7 . ? [77 .]</p>
+<p> 23. 9 . 21 21 . 17 . ? [27 .]</p>
+<p> 24. 20 . 63 27 . 23 . ? [13 .]</p>
+<p> 25. , ? [1440; 10080]</p>
+<p> 26. ? ? [1280; 3840]</p>
+<p> 27. ? ? [24000; 42000]</p>
+<p> 28. 19 24 . 17 . 1000 . ? [32 .]</p>
+<p> 29. ( ) ? [8760]</p>
+<p> 30. 15 . 79 , . ? [19 .]</p>
+<p> 31. 69 . 20 ., 1 . ? [29 .]</p>
+<p> 32. 2 2 2 . ? [130]</p>
+<p> 33. 961 . ? [31]</p>
+<p> 34. , . 4 . ? [25 .]</p>
+<p> 35. 7 7 7 . ? [511]</p>
+<p> 36. 9 9 9 . ? [657]</p>
+<p> 37. ( 480 ) 36 . ? [40]</p>
+<p> 38. 17 . 1 . ? [2 . 43 .]</p>
+<p> 39. 1 1 (24 ) 7 . ? [72]</p>
+<p> 40. 1 2 1 . 23 . ? [23]</p>
+<p> 41. 12 37 . 19 24 . ? [9 .]</p>
+<p> 42. 18 18 . 26 26 . ? [10 .]</p>
+<p> 43. 27 37 . 77 13 . ? [20 .]</p>
+<p> 44. 13 39 . 29 17 . ? [10 .]</p>
+<p> 45. 79 19 ., . ? [15 .]</p>
+<p> 46. 1000 . 16 13 . 7 . ? [72 .]</p>
+<p> 47. 15 . 34 25 . 13 . ? [50 .]</p>
+<p> 48. 500 20 . 12 23 . ? [ 28 ]</p>
+<p> 49. 800 . 20 4 . . ? [25 .; 75 .]</p>
+<p> 50. 12 . 8 4 . , . ? [60 .; 1 . 80 .]</p>
+<p> 51. 100 6 . 200 3 . . ? [1 .]</p>
+<p> 52. 20 , 5 5 , 18 . ; . ? [15 .; 60 .; 2 . 40 .]</p>
+<p> 53. 500 . . 7 45 . , , ? [37 .]</p>
+<p> 54. 37 1000 . 30 24 . ? [ 40 .]</p>
+<p> 55. 84 4 . 52 7 . 25 . ? [28 .]</p>
+<p> 56. 47 8 . 1 . ? [17 .]</p>
+<p> 57. 28 , 20 . 8 7 . ? [490 .]</p>
+<p> 58. , 20 , 7 . , 20 ? [3 .]</p>
+<p> 59. 5 1 . 40 . 8 ? [96 .]</p>
+<p> 60. . . 7 ? [4 ]</p>
+<p> 61. . 12 . , 3 . . ? [25 .]</p>
+<p> 62. , . , , 10 . ? [100 .]</p>
+<p> 63. 10 7 . 24 . ? [35 .]</p>
+<p> 64. 980 . , , , 25 . , ? [24500 .]</p>
+<p> 65. 100 ., 65 . , 50 28 . ? [ 3 4 ]</p>
+<p> 66. 5 ., 10 . 25 ? [35 .]</p>
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+<p> 658. 47 47 ., 170 . ? [13 .]</p>
+<p> 659. 2 . 40 , 35. . ? [280]</p>
+<p> 660. . 12 , 9. 5- , . ? [ 180]</p>
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+<p> 663. 10 . 3 5 36 . ? [7 .; 3 .]</p>
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+<p> 684. 40 . 4 . 50 . . 250 . ? [80 .]</p>
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+<p> 686. 28 , . 7 . ? [36]</p>
+<p> 687. 1600 . 26 , , 17 9 . 42 . . ? [47; 89 .]</p>
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+<p> 689. 10 13 (), 12 1 . ? [27]</p>
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+<p> 691. , ? : . ? [7 . 20 .]</p>
+<p> 692. , . ? [1440]</p>
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+<p> 702. 1 1 1 . ? [25 ]</p>
+<p> 703. . 20- , . . 20 , 200 , 130 26 . 70 . ? [56 .]</p>
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+<p> 705. 25 , . , . ? [24 ; 24 ; 24 ]</p>
+<p> 706. 1000 . . ? [3375 .]</p>
+<p> 707. . 675 . ? [200 .]</p>
+<p> 708. 5 . 256 . 25 . . ? [625 .]</p>
+<p> 709. 625 . 20 . . 4 ? [1296 .]</p>
+<p> 710. 26 26 28 28 . ? [4 ]</p>
+<p> 711. 72 1 1 . , , . ? [1 ]</p>
+<p> 712. 73 , 8 4 . ? [47; 26]</p>
+<p> 713. 8 , 12 16 15 . , , , . ? [90 .; 45 .; 15 .]</p>
+<p> 714. 27 4 . 2 . 40 . . , 18 .? [ 2 . 80 .]</p>
+<p> 715. 400 . 8 , 6 , 4 . , . ? [8 .; 24 .; 48 .]</p>
+<p> 716. 16 , 9 4 200 . , . ? [4 .; 8 .; 16 .]</p>
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+<p> 718. 12 . 237 , 2 13 . ? [25]</p>
+<p> 719. 12 12 . 3 . ? [64 .]</p>
+<p> 720. 16 . 16 16 . 6 . ? [40 .]</p>
+<p> 721. 11 , 11 , 11 . 37 37 . ? [27 .]</p>
+<p> 722. : 1 , 2, 3, .. ? [ 25 ]</p>
+<p> 723. 40 . , 12 . 50 . , 2 . . ? [400 .]</p>
+<p> 724. 10 , 8 . 2 . 50 . . ? [100 .]</p>
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+<p> 726. 378 . 63 , 54, 27. 378 ? [14 ]</p>
+<p> 727. 43 93 . 23 87 . ? [6000 .]</p>
+<p> 728. 5000 . 49 51 . 41 . ? [61 .]</p>
+<p> 729. 18 . 25 . ? [60 .]</p>
+<p> 730. . 12 , , 9 . ? [72 ]</p>
+<p> 731. . 6, 8 . 4- , . ? [192]</p>
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+<p> 736. 5 . . 35 3 . 6 . 5 . . ? [100]</p>
+<p> 737. 3 , 5. 4 , 15. ? [83]</p>
+<p> 738. . 2 . 25 ., 2 . 40 . 2 . 75 ., 5 . 60 . . , ? [16; 2 . 40 .]</p>
+<p> 739. 28 3 . 50 . 24 4 . 25 . , 8 .? [ 4 .]</p>
+<p> 740. 4 ., , . 55 ., , . ? [13 .; 17 .]</p>
+<p> 741. 20 ., . 200 ., . ? [90 .]</p>
+<p> 742. : 16 16 ., 8 18 ., 16 13 . 28 14 . ? [10 .]</p>
+<p> 743. 4 . 8 . 4 , 3 . 40 . ? [24]</p>
+<p> 744. 20 , 12 , . 7 4 . ? [4 7 ; 8 4 ]</p>
+<p> 745. 6 . 21 , 6 4 . ? [6 6 ; 15 4 ]</p>
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+<p> 747. 15 . 3&#189; . 7 , 24 ? [720]</p>
+<p> 748. 80 , 8 5 , 28 7 24 6 . ? [1 ]</p>
+<p> 749. 32 17 ., 32 23 ., 18 13 . 28 27 . ? [20 .]</p>
+<p> 750. 40 . 11 , 12- 9-. ? [7 12 ; 4 9 ]</p>
+<p> 751. 1000 . 44 18 26 . ? [18; 26]</p>
+<p> 752. 1000 . 26 18 ., 18 26 . 8 . ? [8 .]</p>
+<p> 753. 4 . 10 . 7 , 3 , . ? [ 10 ]</p>
+<p> 754. 31 4 , 18 . 1 13 , 1 11 . ? [7; 11]</p>
+<p> 755. . 4 6 . 8 . ? [6 ]</p>
+<p> 756. . 8 , , 9 . ? [48]</p>
+<p> 757. 10 13 1 25 . ? [13 1 ]</p>
+<p> 758. 15 20 1 9 2 . ? [12]</p>
+<p> 759. . 7&#189; . ? [1168]</p>
+<p> 760. 32 10 2 16 8 2 . ? [15 ]</p>
+<p> 761. 2 1 15 , 1 13 . ? [27]</p>
+<p> 762. 5 3 1 . 1 7 . ? [23]</p>
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+<p> 875. . , , , . ? [9; 7]</p>
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+<p> 921. , . 3 , , . 3 , . ? [12]</p>
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+<p> 945. 770 . , . ? [576; 192; 2]</p>
+<p> 946. 1 . , . ? 350 ; 150 ]</p>
+<p> </p>
+<p> 947. 20 , 15 . ? </p>
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+<p> 952. 15 , 8 . 4 , 2 8 . ? [12]</p>
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+<p> 962. 28 , 8 . 4 2 , 3. 54 . ? [12 .]</p>
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+<p> 965. 5 , 28 . ? [180]</p>
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+<p> 967. 8 , 7 8 6 . 12 8 , 12 ? [15 .]</p>
+<p> 968. 6 , 6 , , 12 ? [64]</p>
+<p> 969. 12 , 8 , , 12 ? [384]</p>
+<p> 970. , 40 . 1 8 ? [80]</p>
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+<p> 974. 35, 12 14 . , 25 , 24? [20]</p>
+<p> 975. 8 , , 60 . 9 , 8? [90 .]</p>
+<p> 976. 12 , 12 . , , 4 8 , 12 ? [6]</p>
+<p> 977. 12 , 1 4 . , 13 , 6, 3 , 3 , 2? [4]</p>
+<p> 978. 12 , 7 8 , 5 . 9 , 8? [4 .]</p>
+<p> 979. 80 1 4 . 2 ? [50] </p>
+<p> 980. 12 , 7, 2. 1 75 . ? [126 .]</p>
+<p> 981. , 4 , 5 . 1 1 . 25 . ? [50 .]</p>
+<p> 982. 2 , 3, 7 . 40 . ? [1680]</p>
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+<p> 985. 12 , 12 3 12 . ? [20]</p>
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+<p> 987. 12 , 6 , 2 . 18 , 12, 9. 3 , ? [ 4 ]</p>
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+<p> 991. 16 , 12. , 6 ? [24]</p>
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+<p> 994. 2 , 1&#189;, 1 . , () 1 ? [576]</p>
+<p> 995. 40 1 37 1 . ? [25 ]</p>
+<p> 996. 1 , 8 , 3 . 150 , 1 2 ? [160 ]</p>
+<p> 997. 1 7 1 . 300 . ? [8]</p>
+<p> 998. 10 , 4 , 2 12 . ? [90]</p>
+<p> 999. 7 , 5 , 4 . ? [560]</p>
+<p> 1000. 3 , 2 8 15 . 10 , ? [120 .]</p>
+<p> 1001. 8 , 4 , 1 1 8 . 1 . 50 . ? [72 .] </p>
+
+
+
+
+
+
+
+<pre>
+
+
+
+
+
+End of the Project Gutenberg EBook of 1001 tasks for mental calculation
+by Sergej Aleksandrovich Rachinskij
+
+*** END OF THIS PROJECT GUTENBERG EBOOK 1001 TASKS FOR MENTAL CALCULATION ***
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