这种题目困扰我好久了x=2y-32y=3zx+y+z=41 3x-y+2z=32x+y-3z=11x+y+z=124x+

这种题目困扰我好久了x=2y-32y=3zx+y+z=41 3x-y+2z=32x+y-3z=11x+y+z=124x+ 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) x+y+z+sin(x+2y+3z)=0,求Zx偏导. x/2=y/3=z/5 x+3y-z/x-3y+z (x+y-z)(x-y+z)= 已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3 x=z-y2x+3y=2+2zx+2y+3z=14 帮我解方程组：3x-y+z=3,2x+y-3z=11,x+y+z=12.x=?y=?z=? 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 已知x+2y-3z=0，2x+3y+5z=0，则x+y+zx-y+z= ___ ． 已知xy/x+y=3,yz/y+z=2,zx/z+x=1,求y的值 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少,