Вычислите: -15+7, -6+11, -8-10, 5-12,-7+7.
-15+7= -8 -6+11=5 -8-10= -18 5-12= -7 -7+7=0
-15 + 7 = -8; -6 + 11 = 5; -8 - 10 = -18; 5 - 12= -7; -7 + 7 = 0