4x²-(x-y)²过程

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4x²-(x-y)²过程4x²-(x-y)²过程4x²-(x-y)²过程原式=[2x+(x-y)][2x-(x-y)]=(3x-y)(x+y

4x²-(x-y)²过程
4x²-(x-y)²过程

4x²-(x-y)²过程
原式=[2x+(x-y)][2x-(x-y)]
=(3x-y)(x+y)