x:y=1/5:3/10,x:z=1/4:1/3求x:y:z
X+Y+Z=200,1/3X+4Y+5Z=200,求X,Y,Z等于多少?
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+z)/9=(2x+y+3z)/10=-(3x+2y-4z)/3=1 连等,求x,y,z,
x,y,z属于正实数,且3x+4y+5z=1 求1/(x+y)+1/(y+z)+1/(x+z)的最小值
已知x:y:z=4:5:7,求:(1)2x+3y+z/5z; (2)x+y/y+z.
已知1/3x=1/4y=1/5z,求x:y:z
2x+3y+z=1 x+y+z=-2 3x-2y-z=-4 求x、y、z
1:2x-y/3=2y-z/4=2z-x/5 求x+y+z/2x-y
已知x/2=y/3=z/4,求下列各式 (1)(x+y+z)/x (2)(x-y+2x/(x-y-2z)
如果,根号x-3+| y-2 |+z^2=2z-1 求 (x+z)^y
已知3x=4Y,5Y=6Z,求 (1)x:y:z;(2)x+y/y+z.
已知3x=4Y,5Y=6Z,求 (1)x:y:z;(2)x+y/y+z