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kumini2011
2 năm trước
Câu 4: Tính hợp lí a) 1234 - ( 250 + 1234 ) b) - [(-607) + 932 - (-2000)] - (607 - 3932) c) -128 . [(-25) + 89]+128. (89-125) Câu 5: a) 28+2x=55-(-13) b) |x-5| +(-10) = -5 c) Tìm số nguyên n thỏa mãn 6n-11 là bội của n-2
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