∴ . 故曲线C的方程为．·················································································——青夏教育精英家教网—

∴ . 故曲线C的方程为．··················································································· 4分 (2)设.其坐标满足消去y并整理得.故且．··········································································· 6分 .即．而. 于是．所以时..故． ---- --------8分当时..． .··············································· 10分而. 所以．···································································································· 12分【查看更多】

如果曲线C上任意一点的坐标都是方程f(x，y)=0的解，那么(　)

　　A．曲线C的方程是f(x，y)=0

　　B．方程f(x，y)=0的曲线是C

　　C．曲线C上的点都在方程f(x，y)=0曲线上

　　D．以方程f(x，y)=0的解为坐标的点都在曲线C上

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若曲线C上的点的坐标都是方程f(x，y)=0的解，则下面判断正确的是

[　　]

A．曲线C的方程是f(x，y)=0

B．以方程f(x，y)=0的解为坐标的点都在曲线C上

C．方程f(x，y)=0的曲线是C

D．方程f(x，y)=0的曲线不一定是C