3-2(x+1)(x-2)-x^2+3(x+2)(x-3) 其中x=99 先简化再求值(x+1)(x^2+x+1)-(x-1)(x^2-x+1)=(2x+3)(2x-4).求x{(x-1)(y-2)=xy{x(x+2)-4y(y-1)=(x-2y)(x+2y).

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3-2(x+1)(x-2)-x^2+3(x+2)(x-3) 其中x=99 先简化再求值(x+1)(x^2+x+1)-(x-1)(x^2-x+1)=(2x+3)(2x-4).求x{(x-1)(y-2)=xy{x(x+2)-4y(y-1)=(x-2y)(x+2y).
3-2(x+1)(x-2)-x^2+3(x+2)(x-3) 其中x=99 先简化再求值
(x+1)(x^2+x+1)-(x-1)(x^2-x+1)=(2x+3)(2x-4).求x
{(x-1)(y-2)=xy
{x(x+2)-4y(y-1)=(x-2y)(x+2y).

3-2(x+1)(x-2)-x^2+3(x+2)(x-3) 其中x=99 先简化再求值(x+1)(x^2+x+1)-(x-1)(x^2-x+1)=(2x+3)(2x-4).求x{(x-1)(y-2)=xy{x(x+2)-4y(y-1)=(x-2y)(x+2y).
第一个=3-2(x^2-x-2)-x^2+3(x^2-x-6)=-x-11其中x=99时,原式=-110
第二个两边分别把括号打开x^3+2x^2+2x+1-x^3+2x^2-2x+1=4x^2-2x-12化简4x^2+2=4x^2-2x-12==>x=-7
第三个括号打开第一式xy-y-2x+2=xy==>2x+y=2
第二式x^2+2x-4y^2+4y=x^2-4y^2==>2x+4y=0
联立解得x=4/3 y=-2/3

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