Вычислите: 1) 5/9+3/4; 2) 4/9+11/15; 3) 1/9-10/99; 4) 5/6-3/4; 5) 5/8+7/9; 6) 7/30+11/36; 7) 8/11-5/12 8) 8/11-5/8.

Question

Харлуша

Математика

19 октября, 06:28

Вычислите: 1) 5/9+3/4; 2) 4/9+11/15; 3) 1/9-10/99; 4) 5/6-3/4; 5) 5/8+7/9; 6) 7/30+11/36; 7) 8/11-5/12 8) 8/11-5/8.

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Snezh · Answer 1

1) 5/9 + 3/4 = (5 * 4 + 3 * 9) / 36 = 47/36.

2) 4/9 + 11/15 = (4 * 5 + 11 * 3) / 45 = 53/45.

3) 1/9 - 10/99 = (1 * 99 - 10 * 1) / 99 = 89/99.

4) 5/6 - 3/4 = (5 * 2 - 3 * 3) / 12 = 1/12.

5) 5/8 + 7/9 = (5 * 9 + 7 * 8) / 72 = 99/72 = 11/8 = 1 3/8.

6) 7/30 + 11/36 = (7 * 12 + 11 * 10) / 360 = 194/360 = 97/180.

7) 8/11 - 5/12 = (8 * 12 - 5 * 11) / 132 = 41/132.

8) 8/11 - 5/8 = (8 * 8 - 5 * 11) / 88 = 9/88.