Question

十字相乘法分解因式，只需结果。谢谢啦

1.x^2-5x+6 2.x^2+4x-12 3.x^2-5x-24

Answer 1

1、(-2)×(-3)=6，(-2)+(-3)=-5
因此：x^2-5x+6=(x-3)(x-2)

2、(-2)×6=-12，(-2)+6=4
因此：x^2+4x-12=(x-2)(x+6)

3、3×(-8)=-24，3+(-8)=-5
因此：x^2-5x-24=(x+3)(x-8)

Answer 2

1.x^2-5x+6
=(x-2)(x-3)
2.x^2+4x-12
=(x+6)(x-2)
3.x^2-5x-24
=(x-8)(x+3)

Answer 3

x^2-5x+6=(x-3)(x-2)
x^2+4x-12 =(x+6)(x-2)
x^2-5x-24=(x-8)(x+3)

Answer 4

1. (x-2)(x-3)
2. (x+6)(x-2)
3. (x-8)(x+3)

Answer 5

(x-2)(x-3)
(x-2)(x+6)
(x+3)(x-8)