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数学
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解方程x²-2xy+y²=9,x²+4xy+4y²+x+2y=2 2x-1/y=3,x/y=2
人气:342 ℃ 时间:2020-03-29 08:07:00
解答
(x-y)^2=9,(x+2y)^2+(x+2y)=2,2x-1/y=3[2xy-1=3y],x=2y[4y^2-3y-1=0,y=1或者y=-1/4],x=2或者x=-1/2
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