Найдите значение выражения: 3/4:(1-1/4+3/8); (1/3+1/4):(2-5/6);

1) 3/4 : (1 - 1/4 + 3/8) = 3/4 : (8/8 - 2/(4 * 2) + 3/8) = 3/4 : (8/8 - 2/8 + 3/8) = 3/4 : (8 - 2 + 3)/8 = 3/4 : 9/8 = 3/4 * 8/9 = (3 * 8)/(4 * 9) = 2/3;

Ответ: 2/3.

2) (1/3 + 1/4) : (2 - 5/6) = (4/12 + 3/12) : (2 * 6/6 - 5/6) = (4 + 3)/12 : (12/6 - 5/6) = 7/12 : (12 - 5)/6 = 7/12 * 6/7 = (7 * 6)/(12 * 7) = 6/12 = 1/2;

Ответ: 1/2.