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minhhoang1999
2 năm trước
1.Tìm x: a)3x(12x-4)-9x(4x-3)=30 b)x(5-2x)+2x(x-1)=15 c)2x(3x+1)+(4-2x)3x=7 2. tính đa thức A cho: A=a^2(a+b)-b(a^2-b^2)+2021tại a=1;b=-1
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