化简?(x+y)(a+b)-(x-y)(2a+b) 不全部拆开如何化简?

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化简?(x+y)(a+b)-(x-y)(2a+b) 不全部拆开如何化简?
化简?(x+y)(a+b)-(x-y)(2a+b) 不全部拆开如何化简?

化简?(x+y)(a+b)-(x-y)(2a+b) 不全部拆开如何化简?
是这样的的楼主
化简?(x+y)(a+b)-(x-y)(2a+b)
=(x+y)(a+b)-(x-y)(a+a+b)
=(x+y)(a+b)-(x-y)(a+b) -a(x-y)
=(a+b)(x+y-x+y)-a(x-y)
=2y(a+b)-a(x-y)
=2ay+2by-ax+ay
=3ay+2by-ax

﹙x＋y﹚﹙a＋b﹚－﹙x－y﹚﹙2a＋b﹚
＝﹙x＋y﹚﹙a＋b﹚－﹙x－y﹚﹙a＋b﹚－a﹙x－y﹚
＝2﹙a＋b﹚y －a﹙x－y﹚
＝2ay＋2by－ax＋ay
＝3ay＋2by－ax.

UP 数学没学好 ····来人帮忙把

(x+y)(a+b)-(x-y)(2a+b)
=(x+y)(a+b)-(x-y)(a+b+a)
=(x+y)(a+b)-(x-y)(a+b)-(x-y)a
=(x+y-x+y)(a+b)-(x-y)a
=2y(a+b)-(x-y)a
=2ya+2yb-xa+yb
=2ya-xa+3yb

(x+y)(a+b)-(x-y)(2a+b)=(x+y)(a+b)-a(x-y)-(x-y)(a+b)=(a+b)(x+y-x+y)-a(x-y)
=2y(x+y)-a(x-y)

化简(x-y)(a+b)-(x-y)(a-b) (x+y)-(a-b)(x+y)因式分解因式分解 a(y-x)-b(x-y) 化简x²/(y-x)-y²/(y-x)的结果是要求写具体过程、A -x-y B y-x C x-y D x+y. (5)a(x+y)-b(x+y)-x-y因式分解通分:-x/a(x-y) ,y/b(y-x) 通分x/a(x-y),y/b(y-x) 通分 a/(y-x)^2,b/(x-y)(x+y) 因式分解a(x-y)+b(y-x)+(2x-y) 化简(y-1/x)-(x-1/y)的结果是A.-y/x B.-x/y C.x/y D.y/x a(x-y)(x+y)-b(y-x)(x+y)-c(x-y)^2(y+x)提取公因式 (a-b)(x-y)-(b-a)(x+y)怎么算 (a+b)(x+y)-(a+b)(x-y)分解因式 (a-b)(x-y)-(b-a)(x+y)因式分解 (a+b)(x+y)-(b+a)(y-x)因式分解快 [a-b][x-y]-[b-a][x+y]的解法 (a-b)(x-y)+(b-a)(y-x) 分解因式：(a-b)(x-y)-(b-a)(x+y)