x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x)
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x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x)x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x)x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x)前面多项
x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x)
x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x)
x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x)
前面多项式提取公因式x 就有前面两个式子合并为：x(x²-6x-9-x²+8x+15)=x(2x+6)=2x(x+3);然后与后面的式子合并同类项,即提取公因式2x得到2x(x+3）+2x(3-x)=2x(x+3+3-x)=12x
x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x)
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