设函数y=f(x)由方程xy+21nx=y4所确定,则曲线y=f(x)在(1,1)处的法线方程为_______.

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问题 设函数y=f(x)由方程xy+21nx=y4所确定,则曲线y=f(x)在(1,1)处的法线方程为_______.

选项

答案y=-x+2

解析 xy+2lnx=y4两边对x求导得y+
将x=1,y=1代入得
故曲线yf(x)在点(1,1)处的法线为y-1=-(x-1),即y=-x+2.
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