Решите уравнения: а)1 2/5 × (-2 1/7) × 1/6 × x = 4 1/2 × 17/18 × 1 2/34 б)3 1/8 × (-1 3/5) × (-4/15) × (-x) = 2 2/17 × 3 7/9 × (-15/16) в)-2 3/8 × (-16/57) × 1 1/5 × x = 7 8/9×33/71×(-1 2/5) г)-2 7/16×(-3 9/13)×(-17/24)×(-x)=-2 5/6×4 1/2×(-1 3/5)