Toán Lớp 8: Làm tính chia
(4X mủ 3-3X-2X mủ 2+1):(x-1)
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Toán Lớp 8: Làm tính chia
(4X mủ 3-3X-2X mủ 2+1):(x-1)
Comments ( 2 )
=\frac{(4x^3+2x^2)+(-4x^2-2x)-x+1}{x-1}
=\frac{2x^2(2x+1)-2x(2x+1)-x+1}{x-1}
=\frac{(2x+1)(2x^2-2x)-x+1}{x-1}
=\frac{2x(2x+1)(x-1)-x+1}{x-1}
=\frac{2x(2x+1)(x-1)}{x-1}+\frac{-x+1}{x-1}
=2x(2x+1)-\frac{x-1}{x-1}
=2x(2x+1)-1
=4x^2+2x-1