rút gọn phân thức : a) 2(x+1)^2/4x(x+1) b) (8-x)(-x-2)/(x+2)^2 c) 2(x-y)/y-x d/x^3+3x^2+3x+1/x^2+x e/ x^3-3x^2+3x-1/2x-2

`a)(2(x+1)^2)/(4x(x+1)`

`=(2.(x+1)(x+1))/(2.2x(x+1)`

`=(x+1)/(2x)`

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`b)((8-x)(-x-2))/(x+2)^2`

`=((8-x).(-1)(x+2))/((x+2)(x+2))`

`=(x-8)/(x+2)`

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`c)(2(x-y))/(y-x)`

`=(2(x-y))/(-1(x-y))`

`=2/(-1)`

`=-2`

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`d)(x^3+3x^2+3x+1)/(x^2+x)`

`=(x+1)^3/(x(x+1))`

`=(x+1)^2/x`

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`e)(x^3-3x^2+3x-1)/(2x-2)`

`=(x-1)^3/(2(x-1)`

`=(x-1)^2/2`

`color{pink}{@hmc}`