20 примеров на вычитание дробей с разными знаминателями

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Никита Антонов

Математика

7 марта, 10:33

20 примеров на вычитание дробей с разными знаминателями

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Анна Антипова · Answer 1

1) 3/5 - ¼ = 3 * 4/20 - 1 * 5/20 = 12/20 - 5/20 = 7/20;

2) 5/8 - 3/7 = 5 * 7/56 - 3 * 8 / 56 = 35/56 - 24/56 = 11/56;

3) 13/15 - 4/5 = 13/15 - 4 * 3/15 = 13/15 - 12/15 = 1/15;

4) 1/5 - 2/9 = 1 * 9/45 - 2 * 5/45 = 9/45 - 10/45 = - 1/45;

5) 4/7 - 5/11 = 4 * 11/77 - 5 * 7/77 = 44/77 - 35/77 = 9/77;

6) 2/9 - ¾ = 2 * 4/36 - 3 * 9/36 = 8/36 - 27/36 = - 19/36;

7) ¾ - 12/19 = 3 * 19/76 - 12 * 4/76 = 57/76 - 48/76 = 9/76;

8) 1/6 - 9/19 = 1 * 19/114 - 9 * 6/114 = 19/114 - 54/114 = - 35/114;

9) 2/3 - 7/8 = 2 * 8/24 - 7 * 3/24 = 16/24 - 21/24 = - 5/24;

10) 7/24 - 1/12 = 7/24 - 1 * 2/24 = 7/24 - 2/24 = 5/24;

11) 9/14 - 1/7 = 9/14 - 2 * 1/14 = 7/14 = ½;

12) 2/3 - 6/17 = 2 * 17/51 - 6 * 3/51 = 34/51 - 18/51 = 16/51;

13) 3/8 - 11/16 = 3 * 2/16 - 11/16 = 6/16 - 11/16 = - 5/16;

14) 2/13 - 6/7 = 2 * 7/91 - 6 * 13/91 = 14/91 - 78/91 = - 64/91;

15) 5/21 - 3/5 = 5 * 5/105 - 3 * 21/105 = 25/105 - 63/105 = - 38/105;

16) 8/9 - 11/12 = 8 * 4/36 - 11 * 3/36 = 32/36 - 33/36 = - 1/36;

17) 7/11 - 4/15 = 7 * 15/165 - 4 * 11/165 = 105/165 - 44/165 = 61/165;

18) 3/16 - 5/6 = 3 * 6/96 - 5 * 16/96 = 18/96 - 90/96 = - 62/96 = - 31/48;

19) 4/31 - 2/3 = 4 * 3/93 - 2 * 31/93 = 12/93 - 62/93 = - 50/93;

20) 3/7 - 5/23 = 3 * 23/161 - 5 * 7/161 = 69/161 - 35/161 = 34/161.