Question

帮帮忙~数学的题目！七年级的！十字相乘法！

1.x²-2x-3 2.x²-5x-6 3.x²-9x-10 4.x²-9x-10 5.x²-2x-8 6.x²+2x-8 7.x²-x-12 8.x²+x-12 9.x²+6x-16 10.x²-14x-32 11.x²+7x-18

Answer 1

(x-3)(x+1) (x-6)(x+1) (x-10)(x+1) (x-10)(x+1)(和第3题一样了)
(x-4)(x+2) (x+4)(x-2) (x-4)(x+3) (x+4)(x-3)
(x+8)(x-2) (x-16)(x+2) (x+9)(x-2)
如果是第4题是x²+9x-10的话则分解为（x+10）（x-1）

Answer 2

1.(x-3)(x+1)
2.(x-6)(x+1)
3.(x-9)(x+1)
4.(x-9)(x+1)
5.(x-4)(x+2)
6.(x+4)(x-2)
7.(x-4)(x+3)
8.(x+4)(x-3)
9.(x+8)(x-2)
10.(x-16)(x+2)
11.(x+9)(x-2)

Answer 3

(x-3)(x+1)
(x-6)(x+1)
(x-10)(x+1)
(x-10)(x+1)
(x-4)(x+2)
(x-2)(x+4)
(x-4)(x+3)
(x+4)(x-3)
(x-2)(x+8)
(x-16)(x+2)
(x-2)(x+9)

Answer 4

要我干啥啊