有2sin(3x-2y+z)=3x-2y+z,求x偏导+y偏导
x+y+z+sin(x+2y+3z)=0,求Zx偏导.
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
如果,根号x-3+| y-2 |+z^2=2z-1 求 (x+z)^y
x/2=y/3=z/5 x+3y-z/x-3y+z
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y-
已知3x=4y,2y=5z,试求x:y:z
3x=4y 2y=5z 试求x:y:z
三角函数最值问题已知x,y,z为实数,求:f(x,y,z)=[sin(x-y)]^2+[sin(y-z)]^2+[sin
已知 3x-y+2z=0 2x+y-3z=0,求x :y :z.
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值