Вычислите 1) 3/8+4/9; 2)7/12-3/8; 3)2 5/8+1 3/10; - вопрос №13849271238325813104671045126217178 от meripet2005p08qlb 19.10.2020 16:09

Question

Математика: Вычислите 1) 3/8+4/9; 2)7/12-3/8; 3)2 5/8+1 3/10; 4)6 7/10-4 5/12

meripet2005p08qlb · Answer

3/8 + 4/9 = (3 * 9 + 4 * 8) / (8 * 9) = (27 + 32)/72 = 59/72

7/12 - 3/8 = (7 * 2 - 3 * 3) / 24 = (14 - 9)/24 = 5/24

2 5/8 + 1 3/10 = 2 25/40 + 1 12/40 = 3 37/40

6 7/10 - 4 5/12 = 6 42/60 - 4 25/60 = 2 17/60