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-1\2x^2+xy-1\2y^2 (因式分解)
人气:441 ℃ 时间:2019-12-29 20:20:34
解答
-1\2x^2+xy-1\2y^2
=-1/2(x²-2xy+y²)
=-1/2(x-y)²那么我就没写错
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