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Bichtram
2 năm trước
bài 1 a)2x+12=3(x-7) b)-2(2x-8)+3(4-2x)=(-72)-5(3x-7) bài 2.cho biểu thức:A=(-a-b+c)-(-a-b-c) a)rút gọn A b)tính giá trị của A khi a=1;b=-1;c=-2
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