1.5(2ax-2ay+b)(x-y)
2.(x-y)(a-x)(a-y)
3.3(2a+b)(4a-6b-1)可不可以有过程？1。原式等于10a(x-y)(x-y)+5b(x-y)=5(2ax-2ay)(x-y)+5b(x-y)=结果2。原式等于x(a-x)(a-y)-y(a-x)(a-y)=结果3。原式等于6(2a+b)(2a-3b)-3(2a+b)=3(2a+b)(4a-6b)-3(2a+b)=结果