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数学
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(2X-Y)²-1(X-2Y)(X+2Y)=? 因式分解 过程
人气:190 ℃ 时间:2019-12-23 08:54:15
解答
(2X-Y)²-1(X-2Y)(X+2Y)
=4x²-4xy+y²-(x²-4y²)
=4x²-4xy+y²-x²+4y²
=3x²-4xy+5y²
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