几道数学题,做是会做,但是做不对(1)x2+y2=5,x2-xy-2y2=0(2)x+y=-5,xy=6(3)请设计一个答案为x=-1,y=3的二元二次方程
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![几道数学题,做是会做,但是做不对(1)x2+y2=5,x2-xy-2y2=0(2)x+y=-5,xy=6(3)请设计一个答案为x=-1,y=3的二元二次方程](/uploads/image/z/13414117-13-7.jpg?t=%E5%87%A0%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%98%2C%E5%81%9A%E6%98%AF%E4%BC%9A%E5%81%9A%2C%E4%BD%86%E6%98%AF%E5%81%9A%E4%B8%8D%E5%AF%B9%EF%BC%881%EF%BC%89x2%2By2%3D5%2Cx2-xy-2y2%3D0%282%29x%2By%3D-5%2Cxy%3D6%283%29%E8%AF%B7%E8%AE%BE%E8%AE%A1%E4%B8%80%E4%B8%AA%E7%AD%94%E6%A1%88%E4%B8%BAx%3D-1%2Cy%3D3%E7%9A%84%E4%BA%8C%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B)
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