Question

初二数学因式分解。高手来！！！急急急 尽量把所有都解出来。能写几题是几题 快快快快

1.(x-y)²-4(x-y)+4
2.(p⁴+q⁴)²-4p⁴q⁴
用十字相乘法：
3.x²-2x-15
4.m²+7m-18
5.x²-2x-35
6.x²-2x-3
7.y²-y-2
8.y²+y-2

Answer 1

(x-y-2)^2
(p^4+q^4+2p^2q^2)(p^4+q^4-2p^2q^2)
(x+3)(x-5)
(m-2)(m+9)
(x+5)(x-7)
(x+1)(x-3)
(y+1)(y-2)
(y-1)(y+2)

追问

能把过程也发来吗？

追答

1是吧（x-y）看成u
2是吧p^4+q^4看成a，2p^2q^2看成b
其他的已经算是过程了吧- -

Answer 2

1.(x-y)²-4(x-y)+4
=(x-y-2)²
2.(p⁴+q⁴)²-4p⁴q⁴
=(p⁴+q⁴-2p²q²)(p⁴+q⁴+2p²q²)
=(p²-q²)²(p²+q²)²
=(p+q)²(p-q)²(p²+q²)²
用十字相乘法：
3.x²-2x-15
=(x-5)(x+3)
4.m²+7m-18
=(m+9)(m-2)
5.x²-2x-35
=(x-7)(x+5)
6.x²-2x-3
=(x-3)(x+1)
7.y²-y-2
=(y-2)(y+1)
8.y²+y-2
=(y+2)(y-1)

Answer 3

1.(x-y)²-4(x-y)+4
=（x-y-2）²

2.(p⁴+q⁴)²-4p⁴q⁴
=（p^4-q^4)²
=（p²+q²）²（p+q）²（p-q）²

3.x²-2x-15=（x-5)(x+3)

4.m²+7m-18=（m+9）（m-2)

5.x²-2x-35=（x-7)(x+5)

6.x²-2x-3=（x-3)(x+1)

7.y²-y-2=（y-2)(y+1)

8.y²+y-2=（y+2)(y-1)

Answer 4

2、(p⁴-q⁴)²=0
3、X1=-3；X2=5
4、 X1=2；X2=-9
5、X1=-5；X2=7
6、X1=-1；X2=3
7、X1=-1；X2=2
8、X1=1；X2=-2
第一二题啥意思啊？能写清楚点吗？