解方程x²-2xy+y²=9,x²+4xy+4y²+x+2y=2 2x-1/y=3,x/y=2
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![解方程x²-2xy+y²=9,x²+4xy+4y²+x+2y=2 2x-1/y=3,x/y=2](/uploads/image/z/1104788-20-8.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8Bx%26%23178%3B-2xy%2By%26%23178%3B%3D9%2Cx%26%23178%3B%2B4xy%2B4y%26%23178%3B%2Bx%2B2y%3D2+2x-1%2Fy%3D3%2Cx%2Fy%3D2)
解方程x²-2xy+y²=9,x²+4xy+4y²+x+2y=2 2x-1/y=3,x/y=2
解方程x²-2xy+y²=9,x²+4xy+4y²+x+2y=2 2x-1/y=3,x/y=2
解方程x²-2xy+y²=9,x²+4xy+4y²+x+2y=2 2x-1/y=3,x/y=2
(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