】x(x+1)+x^2(x-1)
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】x(x+1)+x^2(x-1)】x(x+1)+x^2(x-1)】x(x+1)+x^2(x-1)x(x+1)+x^2(x-1)=x^2+x+x^3-x^2=x+x^3
】x(x+1)+x^2(x-1)
】x(x+1)+x^2(x-1)
】x(x+1)+x^2(x-1)
x(x+1)+x^2(x-1)
=x^2+x+x^3-x^2
=x+x^3
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分解因式----（X*X-X)(X*X-X-2)+1
】x(x+1)+x^2(x-1)
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