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已知3x+2y=0,求(1+(2yy/xx-yy))(1-(2y/(x+y))
人气:315 ℃ 时间:2020-03-25 14:31:45
解答
3x+2y=0
x=-2y/3
(1+(2yy/xx-yy))(1-(2y/(x+y))
=(1+2y^2/(4/9-1)y^2)(1-2y/(-2/3+1)y)=(1-18/5)(1-6)=13
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