4/51:1 2/17-57/64 подскажите
1)4/51 ÷ 1 2/17 = 4/51 ÷ 19/17 = 4/51 × 17/19 = 68/969= 4/57 2)4/57 - 57/64 =(4 × 64 - 57 × 57)/3648 = 256/3648 - 3249/3648 = - 2993/3648 ответ: - 2993/3648