x^2+2y^2+3z^2=6怎么求偏导 求了后可以得到法向量的

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? 请问怎么由2x-3y+z=0 ,3x-2y-6z=0 得到x=3z,y=4z x+y+z=6 x+2y+3z=14 y+1=z 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+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 3x-y+z=4,2z+3y-z=12,x+y+z=6的解 ｛x-z=-1 2x+y+3z=5 x +y-z=1 怎么解, 3x+2y+z=315 x+2y+3z=285怎么解 x+2z=3 2x+y=2.2y+z=7怎么解 x-z=-4 z-2y=-1 x+y-z=-1 怎么解 {x:y:z=3:4:5 {x+2y+z=48 怎么解 (x-2y+z)(-x+2y+z)怎么解? (X+Z)(X-Z)+x(X+2Y)怎么解? 5x+y-2z=17 2x-3y+7z=8 6x+2=3(y+6z) 怎么求啊 5x y-2z=17 2x-3y 7z=8 6x 2=3(y 6z)怎么算 2(x+y-z)-3(x-y+z)-5(x+y-z)+6(x-y+z) 计算 {x+y-z=2 4x-2y+3z+8=0 x+3y-2z-6=0怎么解?