1 целая 1/3*(-3/4)-(-2 целых 1/7)*1 целую 2/5

Спасибо

1 1/3 * (-3/4) - (-2 1/7) * 1 2/5 = 21) 1 1/3 * (-3/4) = 4/3 * (-3/4) = - 12) (-2 1/7) * 1 2/5 = - 15/7 * 7/5 = - 15/5 = - 33) - 1 - (-3) = - 1 + 3 = 3 - 1 = 2Пояснения:1 целая 1/3 = (1*3+1)/3 = 4/32 целых 1/7 = (2*7+1)/7 = 15/71 целая 2/5 = (1*5+2)/5 = 7/5