解:x³-2x²-5x+6
=x³-x²-(x²+5x-6)
=x²(x-1)-(x-1)(x+6)
=(x-1)(x²-(x+6))
=(x-1)(x²-x-6)
=(x-1)(x+2)(x-3)
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X^2(X-3) + X(X-3) - 2(X-3)
x^3-2x^2-5x+6=x^3-3x^2+x^2-5x+6
=x^2(x-3)+(x-2)(x-3)
=(x-3)(x^2+(x-2))
=(x-3)(x+2)(x-1)