Ответ:
(2x+y)²-(x-2y)²
4x²+4xy+y²-(x²-4xy+4y²)
4x²+4xy+y²-x²+4xy-4y²
3x²+8xy-3y²
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Verified answer
Ответ:
(2x+y)²-(x-2y)²
4x²+4xy+y²-(x²-4xy+4y²)
4x²+4xy+y²-x²+4xy-4y²
3x²+8xy-3y²