Найдите значения выражения 2 5/6 - (1 5/9+1/4)= 7/20 - (3 5/8- 3 2/5)= 3/4 - (4/25 + 7/20)=

1) 2 5/6 - (1 5/9 + 1/4) = (2 * 6 + 5)/6 - (1 * 9 + 5)/9 - 1/4 = 17/6 - 14/9 - 1/4 = 17 * 6/36 - 4 * 14/36 - 9/36 = (102 - 56 - 9)/36 = 37/36;

Ответ: 37/36.

2) 7/20 - (3 5/8 - 3 2/5) = 7/20 - (3 * 8 + 5)/8 + (3 * 5 + 2)/5 = 7/20 - 29/8 + 17/5 = 2 * 7/40 - 5 * 29/40 + 8 * 17/40 = (14 - 145 + 136)/40 = 5/40 = 1/8;

Ответ: 1/8.

3) 3/4 - (4/25 + 7/20) = 3/4 - 4/25 - 7/20 = 3 * 25/100 - 4 * 4/100 - 5 * 7/100 = (75 - 16 - 35)/100 = 24/100 = 6/25;

Ответ: 6/25.