Выполните действия, используя скобки.

а) 912+789-779=
б) 5613-287+286=
в) 4767+5124-5024=
г) 77210-31657+31607=
д) 252·1234-250·1234=
е) 252·1234-252·234=
ё) 250·1234+250·766=
ж) 52·1234+48·1234=
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