因式分解：3题：1.(x+a)^2-(y-a)^2

显示全部楼层 · 2012-10-26 20:34:58

1.(x+a)^2-(y-a)^2 =[(x+a)+(y-a)][(x+a)-(y-a)]=(x+y)(x-y+2a) 2.-9+(x+2)^2=(x+2)2-9=（x+2+3)(x+2-3)=(x+5)(x-1) 3.4-12（x-y)+9(x-y)^2=[2-3(x-y)]2=(2-3x+3y)2...

千问 · 2012-10-26 20:34:58

1.(x+a)^2-(y-a)^2=(X+a-y+a)(x+a+y-a)=(x-y+2a)(x+y) 2.-9+(x+2)^2=(x+2-3)(x+2+3)=(x-1)(x+5)3.4-12（x-y)+9(x-y)^2=(2-3x+3y)2...

千问 · 2012-10-26 20:34:58

1，(x﹢a)2‐(y‐a)2=(x﹢a﹢y-a)(x﹢a-y﹢a)=(x﹢y)(x-y﹢2a)2，-9﹢(x﹢2)2=(x﹢2﹢3)(x﹢2-3)=(x﹢5)(x-1)3,4-12(x-y)﹢9(x-y)2={3(x-y)-2}2...

千问 · 2012-10-26 20:34:58

1.（x+y)(x-y+2a)2.(x+5)(x-1)
3.(3x-3y-2)^2...