1целая 1/3*(-3/ 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