(x²-y²)-4(2x²-2y²)化简

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(x²-y²)-4(2x²-2y²)化简(x²-y²)-4(2x²-2y²)化简(x²-y²)-4(

(x²-y²)-4(2x²-2y²)化简
(x²-y²)-4(2x²-2y²)化简

(x²-y²)-4(2x²-2y²)化简
-7X²+7Y²