(5x+2y)²-2(5x+y)(5x-y)
=(5x+2y)(5x+2y-10x+2y)
=-(5x+2y)(5x-4y)
å¦ææ¯å å¼å解ï¼é£ä¹çæ¡å°±æ¯-(5x+2y)(5x-4y)
=-25x²+20xy-10xy+8y²
=-25x²+10xy+8y²
å¦ææ¯å°å¼åå解ï¼é£ä¹-25x²+10xy+8y²å°±æ¯çæ¡ã
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