4+12(x-y)+9(x-y)^2你能写一写过程么?

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4+12(x-y)+9(x-y)^2你能写一写过程么?

4+12(x-y)+9(x-y)^2你能写一写过程么?
4+12(x-y)+9(x-y)^2你能写一写过程么?

4+12(x-y)+9(x-y)^2你能写一写过程么?
原式=[2+3(x-y)]^2=(2+3x-3y)^2

4+12(x-y)+9(x-y)2
=22+2×2×3(x-y)+[3(x-y)]2
=[2+3(x-y)]2
=(2+3x-3y)2;