x³+x²-3x+1
当x=1时；方程x³+x²-3x+1=0
所以x³+x²-3x+1的一个因式为(x-1)
x³+x²-3x+1
=x³+x²-2x-x+1
=x(x+2)(x-1)-(x-1)
=(x-1)(x²+2x-1)
x的3次方+x的2次方-3x+1
=x的3次方+x的2次方-2x-x+1
=x(x^2+x-2)-(x-1)
=x(x+2)(x-1)-(x-1)
=(x-1)(x^2+2x-1)
一个因式为x-1
x³+x²-3x+1
=x³-x²+2x²-3x+1
=x²(x-1)+(x-1)(2x-1)
=(x-1)(x²+2x-1)
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