Вопрос:

6. Вычислите: 1) 3/4 + 5/7; 2) 3/4 - 9/14; 3) 11/12 - 2/3; 4) 7/25 + 4/10; 5) 11/18 - 5/12; 6) 13/18 + 7/15; 7) 19/24 - 25/36; 8) 5/6 - 3/4 + 5/24; 9) 5/8 + 11/28 - 9/14.

Фотография

Ответ ассистента

1) 3/4 + 5/7 = 21/28 + 20/28 = 41/28 = 1 13/28 2) 3/4 - 9/14 = 21/28 - 18/28 = 3/28 3) 11/12 - 2/3 = 11/12 - 8/12 = 3/12 = 1/4 4) 7/25 + 4/10 = 14/50 + 20/50 = 34/50 = 17/25 5) 11/18 - 5/12 = 22/36 - 15/36 = 7/36 6) 13/18 + 7/15 = 65/90 + 42/90 = 107/90 = 1 17/90 7) 19/24 - 25/36 = 57/72 - 50/72 = 7/72 8) 5/6 - 3/4 + 5/24 = 20/24 - 18/24 + 5/24 = (20 - 18 + 5) / 24 = 7/24 9) 5/8 + 11/28 - 9/14 = 35/56 + 22/56 - 36/56 = (35 + 22 - 36) / 56 = 21/56 = 3/8

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