1/x+2/y+3/z=5,3/x+2/y+1/z=7,求1/x+1/y+1/z
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
已知x:y:z=4:5:7,求:(1)2x+3y+z/5z; (2)x+y/y+z.
如果,根号x-3+| y-2 |+z^2=2z-1 求 (x+z)^y
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-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
已知x:y:z=1:2:3,x+y+z=24,求x,y,z
已知{x:y:z=1:2:3,x+y+z=12,求x、y、z的值
{5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=-
(x-2y+z)/9=(2x+y+3z)/10=-(3x+2y-4z)/3=1 连等,求x,y,z,
2x+3y+z=1 x+y+z=-2 3x-2y-z=-4 求x、y、z
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值
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=