Выполните действие 1/8 + 1/4; 2/3-5/9; 1/2-5/12; 5/12-2/9; 1/8+7/12; 3/4-1/6; 5/9+3/4; 23/40-3/8; 9/35-3/28

Question

Яла

Математика

12 июня, 00:26

Выполните действие 1/8 + 1/4; 2/3-5/9; 1/2-5/12; 5/12-2/9; 1/8+7/12; 3/4-1/6; 5/9+3/4; 23/40-3/8; 9/35-3/28

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Gliuk · Answer 1

1) 1/8 + 1/4 = 1/8 + 1/4 * 2/2 = 1/8 + 2/8 = 3/8;

2) 2/3 - 5/9 = 2/3 * 3/3 - 5/9 = 6/9 - 5/9 = 1/9;

3) 1/2 - 5/12 = 1/2 * 6/6 - 5/12 = 6/12 - 5/12 = 1/12;

4) 5/12 - 2/9 = 5/12 * 3/3 - 2/9 * 4/4 = 15/36 - 8/36 = 7/36;

5) 1/8 + 7/12 = 1/8 * 3/3 + 7/12 * 2/2 = 3/24 + 14/24 = 17/24;

6) 3/4 - 1/6 = 3/4 * 6/6 - 1/6 * 4/4 = 18/24 - 4/24 = 14/24 = 7/12;

7) 5/9 + 3/4 = 5/9 * 4/4 + 3/4 * 9/9 = 20/36 + 27/36 = 47/36 = 1 11/36;

8) 23/40 - 3/8 = 23/40 - 3/8 * 5/5 = 23/40 - 15/40 = 8/40 = 1/5;

9) 9/35 - 3/28 = 9/35 * 4/4 - 3/28 * 5/5 = 36/140 - 15/140 = 21/140 = 3/20.