1.已知3x=2y=5z≠0.求x+2y+3y/x-y+z的值.

已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 已知2x+3y-4z=0,3x+4y-5z=0.求x+y+z除以x-y+z, 1.已知3x=2y=5z≠0.求x+2y+3y/x-y+z的值. 1.已知x:y:z=4:5:7,求：（一）2x+3y+z/5z； （二）x+y/y+z 非常急, 已知 x/2 = y/3 = z/5 ≠ 0 求 (x-y+3z) / (3x+2y) 已知{x-5y+2z=0 3x-5y-4z=0,求x：y:z 已知x:y:z=1:3:5,求（2x+3y-z)/(x+y-2z)的值 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 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=3:4:5,求4X+3Y-2Z/X+Y+Z的值 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. 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知：x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值. 已知z、y、z同时满足x+3y-5z=0,2x-y-3z=0,求x:y:z 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 已知x+y-3z=0.x-y-z=0,求3x+2y-z分之x+y+z的值.