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[问答题]曲面x2+2y2+3z2=21在点(1,-2,2)的法线方程为-------------.
[问答题]曲面x2+2y2+3z2=21在点(1,-2,2)的法线方程为-----------.
[问答题]曲面x2+2y2+3z2=21在点(1,-2,2)的法线方程为------------.
[单选题]曲面z=x2-y2在点(,-1,1)处的法线方程是().A . B . C . D .
[单选题](2006)曲面z=1-x2-y2在点处的切平面方程是:()A . B . C . D .
[单选题]曲面z=y+lnx/z在点(1,1,1)处的法线方程是:()A . (x-1)/1=(y-1)/1=(z-1)/-1B . (x-1)/1=(y-1)/1=(z-1)/-2C . (x-1)/1=(y-1)/-1=(z-1)/-2D . x+y-z=1
[试题]求椭球面x2+2y2+z2=4在点(1,-1,1)处的切平面方程和法线方程.
[单选题]球面x2+y2+z2=14在点(1,2,3)处的切平面方程是().A . (x-1)+2(y-2)-(z-3)=0B . (x+1)+2(y+2)+3(z+3)=0C . (x-1)+2(y-2)+3(z-3)=0D . (x+1)+2(y+2)-(z+3)=0
[单选题]已知曲面方程为x2+y2+z2-2x+8y+6z=10,则过点(5,-2,1)的切平面方程为()。A.2x+y+2z=0B.2x+y+2z=10C.x
[单选题]已知曲面方程为x2+y2+z2-2x+8y+6z=10,则过点(5,-2,1)的切平面方程为()。A.2x+y+2z=0B.2x+y+2z=10C.x