因式分解 x3-2x2-x+2
待办事项: 因式分解 x3-2x2-x+2
解法
$x^{3}-2 x^{2}-x+2$
$\ = x^{2}(x-2)-1(x-2)$
$\ =\left(x^{2}-1\right)(x-2)$
$\ =\left(x^{2}-1^{2}\right)(x-2)$
$\ =(x+1)(x-1)(x-2)$
广告
待办事项: 因式分解 x3-2x2-x+2
解法
$x^{3}-2 x^{2}-x+2$
$\ = x^{2}(x-2)-1(x-2)$
$\ =\left(x^{2}-1\right)(x-2)$
$\ =\left(x^{2}-1^{2}\right)(x-2)$
$\ =(x+1)(x-1)(x-2)$