Verified answer

Пошаговое объяснение:

6 - (-4) = 6 + 4 = 10

-12 - (+3) = -12 - 3 = -(12 + 3) = -15

30 - (-5) = 30 + 5 = 35

-10 - (-10) = -10 + 10 = 10 - 10 = 0

-1 3/7 - (-2 4/7) = -1 3/7 + 2 4/7 = 2 4/7 - 1 3/7 = 1 1/7

5 2/5 - (-3/5) = 5 2/5 + 3/5 = 5 5/5 = 6