已知:2x+3y+z=13,4x^2+9y^2+z^2-2x+15y+3z=82 求:x,y,z的值是多少?
已知x=y/3=z/5.且x+y-2z不等于0.求2x+3y-z/x+y-2z的值是多少
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
已知2x=3y=4z求2x-y+z分之x+y+z的值
已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值.
已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值
已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值.
已知x:y:z=2:3:4,且x+y+z=18,求x,y,z的值
已知x:y:z=2:3:4求x-y+z分之x+y-z的值
已知:2X-3y+2z=0,x+4Y-9/2z=0求:X:Z的值.X:y:Z的值.X+2y+X/X+y+Z的值. 已知:
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.
已知x+2y+3z=2 3x+y+2z=3 2x+3y+z=4求X+Y+Z的值
已知:x+2y+3z=2,3x+y+2z=3,2x+3y+z=4,求x+y+z的值