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long3241nh
2 năm trước
Đơn giản các biểu thức sau khi bỏ dấu ngoặc: a) (a+b-c)-(b-c+d) b) -(a-b+c)+(a-b+d) c)(a+b)-(-a+b-c) d)-(a+b)+(a+b+c)
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