设实数XY满足x^2+(y-1)^2=1若对满足条件xy不等式y/x-3+c大于等于0恒成立,则c的取值范围
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![设实数XY满足x^2+(y-1)^2=1若对满足条件xy不等式y/x-3+c大于等于0恒成立,则c的取值范围](/uploads/image/z/1660368-48-8.jpg?t=%E8%AE%BE%E5%AE%9E%E6%95%B0XY%E6%BB%A1%E8%B6%B3x%5E2%2B%28y-1%29%5E2%3D1%E8%8B%A5%E5%AF%B9%E6%BB%A1%E8%B6%B3%E6%9D%A1%E4%BB%B6xy%E4%B8%8D%E7%AD%89%E5%BC%8Fy%2Fx-3%2Bc%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E0%E6%81%92%E6%88%90%E7%AB%8B%2C%E5%88%99c%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4)
设实数XY满足x^2+(y-1)^2=1若对满足条件xy不等式y/x-3+c大于等于0恒成立,则c的取值范围
设实数XY满足x^2+(y-1)^2=1若对满足条件xy不等式y/x-3+c大于等于0恒成立,则c的取值范围
设实数XY满足x^2+(y-1)^2=1若对满足条件xy不等式y/x-3+c大于等于0恒成立,则c的取值范围
x^2+(y-1)^2=1上点(X,Y)
Y/X就是直线y=kx斜率
y=kx带入圆
(1+k^2)x-3kx=0
(3k)^2>=0,k<0或k>0
所以k没有最小
y/x-3+c大于等于0不可能恒成立
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