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数学
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计算(x+y/2)的2次方+(x-y/2)的2次方 要过程
人气:170 ℃ 时间:2020-04-04 17:02:19
解答
(x+y/2)的2次方+(x-y/2)的2次方
=x²+xy+y²/4+x²-xy+y²/4
=2x²+y²/2
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