x^3-5x^2+7x-3
问题描述：
x^3-5x^2+7x-3
答
x^3-5x^2+7x-3
=x³-3x²-(2x²-7x+3)
=x²(x-3)-(2x-1)(x-3)
=(x-3)[x²-(2x-1)]
=(x-3)(x²-2x+1)
=(x-3)(x-1)²