1) одна целая пять девятых умножить на 5/7 умножить на 3,6 (найдите значение выражения). 2) 5/36*1,08*5/7=

1. 1 5/9 * 5/7 * 3,6 = 4.

1) 1 5/9 * 5/7 = (1 * 9 + 5) / 9 * 5/7 = (9 + 5) / 9 * 5/7 = 14/9 * 5/7 = (14 * 5) / (9 * 7) = (2 * 7 * 5) / (9 * 7) = (2 * 5) / 9 = 10/9 = 1 (10 - 1 * 9) / 9 = 1 (10 - 9) / 9 = 1 1/9;

2) 1 1/9 * 3,6 = (1 * 9 + 1) / 9 * 3,6 = 10/9 * 3,6 = 10/9 * 36/10 = (10 * 36) / (9 * 10) = 36/9 = (9 * 4) / 9 = 4.

2. 5/36 * 1,08 * 5/7 = 3/28.

1) 5/36 * 1,08 = 5/36 * 108/100 = (5 * 108) / (36 * 100) = (5 * 3 * 36) / (36 * 5 * 20) = 3/20;

2) 3/20 * 5/7 = (3 * 5) / (20 * 7) = (3 * 5) / (5 * 4 * 7) = 3 / (4 * 7) = 3/28.