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

1 1/3 * (-3/4) - (-2 1/7) * 1 2/5 = 2

1) 1 1/3 * (-3/4) = 4/3 * (-3/4) = - 1

2) (-2 1/7) * 1 2/5 = - 15/7 * 7/5 = - 15/5 = - 3

3) - 1 - (-3) = - 1 + 3 = 3 - 1 = 2

Пояснения:

1 целая 1/3 = (1*3+1) / 3 = 4/3

2 целых 1/7 = (2*7+1) / 7 = 15/7

1 целая 2/5 = (1*5+2) / 5 = 7/5