x+y+z=35 y=2x-5 1/3y=1/2z

{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 3x+2y+z=14 ,x+y+z=10,z+2x+3y=1 5 x+y+z=2 x-3y+2z=1 2x+2y+z+5 要具体步骤.. x/2=y/3=z/5 x+3y-z/x-3y+z x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=? 已知x:：y：z=3：4：5,(1)求x+y分之z的值；（2）若x+y+z=6,求x,y,z. x+2y=3 x+y+z=36 2x+y+z=15 2y=3z x-y=1 x+2y+z x-z=-1 2x+z-y=1 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) {5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=- 已知 x,y,z都是正实数,且 x+y+z=xyz 证明 (y+x)/z+(y+z)/x+(z+x)/y≥2(1/x+1 3道高数题,1,函数F(x,y,z)=(e^x) * y * (z^2) ,其中z=z(x,y)是由x+y+z+xyz= 如果,根号x-3+| y-2 |+z^2=2z-1 求 （x+z)^y