Question

十字相乘法!1.4x的平方-12xy+9y的平方-2x+3y-62.x的平方+3ax-10a的平方-x+2a3.(x的平

Answer 1

1.(2x-3y+2)(2x-3y-3)

2.(x+5a-1)(x-2a)

3.(x+1)(x-5)(x^2-4x-4)

4.(x-3)(2x+3)

5.(3y+5)(y+2)

6.2(p+q+1)(p+q+2)

7.(-6x+3y+2)(-10x+5y+40)

手算的,好累呀,多给点分吧.