作业帮2(x-y)+1/2a²(y-x)分解因式
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2(x-y)+1/2a²(y-x)分解因式
2(x-y)+1/2a²(y-x)分解因式
2(x-y)+1/2a²(y-x)分解因式
=2(x-y)-1/2a²(x-y)
=1/2(x-y)(4-a²)
=1/2(x-y)(2+a)(2-a)
2(x-y)+1/2a²﹙y-x﹚
=2(x-y)-1/2a²(x-y)
=1/2(x-y)(4-a²)