Вычислите: 1/10+7/100; 21/100+1/10: 3/5+9/10; 2/3+5/6; 15/24+3/8; 7/6+16/18; 1/12+1/6; 1/2+3/10.

Решение задачи:1) 1 / 10 + 7 / 100 = (10 + 7) / 100 = 17 / 100 = 0,17.2) (21 / 100 + 1 / 10) / (3 / 5 + 9 / 10) = ((21 + 10) / 100) / ((6+9) / 10) = (31 / 100) / (15 / 10) = (31 * 10) / (100 * 15) = 31 / 150.3) 2 /3 + 5 / 6 = 2 * 2 / 6 + 5 / 6 = (4 + 5) / 6 = 9 / 6 = 3 / 2.4) 15 / 24 + 3 / 8 = 15 / 24 + (3 * 3) / 24 = (15 + 9) / 24 = 24 / 24 = 1.5) 7 / 6 + 16 / 18 = (3 * 7 + 16) / 18 = (21 + 16) / 18 = 37 / 18.6) 1 / 12 + 1 / 6 = (1 + 2) / 12 = 3 / 12 = 1 / 4 = 0,25.7) 1 / 2 + 3 / 10 = (5 + 3) / 10 = 8 / 10 = 0,8.