高手come in
问题描述：
高手come in
(1.)x²-5x+6=______
(2.)z²+6z-7=______
(3)2x²-7x+3=_____
(4)2m²+mn-n²=______
(5)-x²+3x-2______
(6)x的4次方-x²-12________
答
1.(x-3)(x-2)
2.(x-1)(x+7)
3.(x-3)(2x-1)
4.(m+n)(2m-n)
5.(x-2)(-x+1)
6.(x²-4)(x²+3)=(x+2)(x-2)(x²+3)