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1. Tính: (-51) - (-79)= (-97).(1-231)-231-97= |-17|-3x= -4 2. Viết tập hợp B các số là bội của -3 3. Tìm tổng tất cả các số nguyên x. Biết: -5 ≤ x <6 |x| < 7
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