Question

初一分解因式题，给过程好吗亲，好的加悬赏哦亲~~~

1.8a-4a²-4
2.(x-2)²+10(x-2)+25
3.﹙z²+1﹚²-4z﹙z²+1﹚+4z²
4.﹙x+y﹚³-4xy﹙x+y﹚
5.﹙x+y)²-(y+x)

Answer 1

1.8a-4a²-4
=-4(a²-2a+1)
=-4(a-1)²
2.(x-2)²+10(x-2)+25
=(x-2+5)²
=(x+3)²
3.﹙z²+1﹚²-4z﹙z²+1﹚+4z²
=﹙z²+1-2z﹚²
=［﹙z-1﹚²］²
=﹙z-1﹚^4
4.﹙x+y﹚³-4xy﹙x+y﹚
=(x+y)［﹙x+y﹚²-4xy］
=(x+y)﹙x-y﹚²
5.﹙x+y)²-(y+x)
=（x+y）［(x+y)-1］
=(x+y)(x+y-1)

Answer 2

　　1.8a-4a²-4=-4﹙a²－2a＋1﹚=-4﹙a－1﹚²

　　2.(x-2)²+10(x-2)+25＝﹙x－2＋5﹚²=﹙x＋3﹚²

　　3.﹙z²+1﹚²-4z﹙z²+1﹚+4z²=﹙z²＋1－2z﹚²=﹙z－1﹚^4

4.﹙x+y﹚³-4xy﹙x+y﹚＝﹙x+y﹚[﹙x+y﹚²－4xy]＝﹙x＋y﹚﹙x²－2xy＋y²﹚=﹙x＋y﹚﹙x-y﹚²

　　5.﹙x+y)²-(y+x)=﹙x＋y﹚﹙x+y－1﹚