Решите задачу:
1) -5/16 * 4/7 = -5/4 * 1/7 = -5/28 2) 21/32 * (-4/9) = 7/8* ( - 1/3) = -7/24 3) -5/28 + 7/24 = -5*24+7*28 /672 = -120+196/672 = 76/672 = 19/168