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数学
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已知x+y=3,xy=-5,求x2y+2xy2分之x2+3xy+2y2
人气:324 ℃ 时间:2020-09-26 22:39:33
解答
x+y=3,xy=-5
(x²+3xy+2y²)/(x²y+2xy²)
=[(x+2y)(x+y)]/[xy(x+2y)]
=(x+y)/(xy)
=3/(-5)
=-3/5
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