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2 năm trước
bài 1 (3x^n+1-2x^n).4x^2 bài 2 rút gọn biểu thức a)-2x(x+1)+(2x-3).(x-2) b)(2x-3).(2x-+3)-4x(x-1)+9 c)9x(3x^2-5x)-(3x+1).(9x^2-18x-1) d)3x^n(6x^n-3+1)-2x^n(9x^n-1) e)5(3x-4y^3)+(9(2x^2-y^3)-2(x^2-y^3)
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