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vuhongthu1979
2 năm trước
Bỏ dấu ngoặc rồi tính a) (123 -27) + (27+13-123) b) (175 + 25 + 13) - (-15 + 175 + 25) c) (2012 - 119 + 29) - (-119 + 29) d) - (55 - 80 + 91) - (2012 + 80 + 91) - (2012 + 80 - 91)
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