过直线{10x+2y-2z=27,x+y-z=0},做曲面3x*x+y*y-z*z=27的切平面,求此切平面方程

过直线{10x+2y-2z=27,x+y-z=0},做曲面3x*x+y*y-z*z=27的切平面,求此切平面方程 求过点(1,2,1)而与两直线{x+2y-z+1=0 x-y+z-1=0和{2x-y+z=0 x-y+z=0平行的平面的方程 x+y/2=z+x/3=y+z/4 x+y+z=27 求过点(1,2,3)且与直线 2x-4y+z=0,{ 3x-y-2z-9=0 平行的直线方程 求过点（3,-2,1）且与直线7X-3Y-Z-6=0、X+Y+2Z=11平行的直线方程 求过直线x+y+z=0,x+2y-2z+1=0又平行于直线x-2y-2=0,x-3z+15=0的平面方程, x+y+z=27 2x+y+3z=53 2x+y+10z=123 用行列式的性质证明：y+z z+x x+y x y z x+y y+z z+x =2 z x y z+x x+y y+z y z x 这个怎么证? (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 求过原点且与直线y+z+1=0 x+2z=0垂直的平面方程,求过原点且与直线y+z+1=0 x+2z=0垂直的平面方程 X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z 求过直线x+y+z-1=0,2x-y+3z=0,且平行于直线x=2y=3z的平面方程 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知：x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值. x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值 (x-2y+z)(x+y-2z)分之（y-x)(z-x) + (x+y-2z)(y+z-2x)分之(z-y)(x-y) + (y+z-2z)(x-2y+z)分之（x-z)(y-z)=?第三部分那个是 （y+z-2x)(x-2y+z)分之（x-z)(y-z) 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian