упр 181. Выполните действия, используя скобки
a) 912 + 789 - 779 =
b) 5613 - 287 + 286 = c) 4767 + 5124 - 5024 =
d) 77210 - 31657 + 31607 = e) 252 · 1234 - 250 - 1234 =
f) 252 · 1234 - 252 · 234 = g) 250 - 1234 + 250 - 766 =
h) 52 - 1234 + 48 · 1234 = - -​
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