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数学
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已知:x+y=12,xy=9,则x²y+2xy²分之x²+3xy+2y²=
人气:121 ℃ 时间:2019-08-19 01:06:36
解答
x²y+2xy²分之x²+3xy+2y²=
=(x+2y)(x+y)/xy(x+2y)
=(x+y)/xy
=12/9
=4/3
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