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j计算x ^2-(4x+5y)(-5y+4x)+(-2x-7y)^2
人气:173 ℃ 时间:2019-12-08 22:29:52
解答
x ^2-(4x+5y)(-5y+4x)+(-2x-7y)^2
=x²-16x²+25y²+4x²-28xy+49y²
=-11x²-28xy+74y²
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