已知x+ 9/y=3,y+ 9/z=3,探究z+ 9/x=3是否成立,并说明理由?

已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 已知｛2x-y-z=0,3x-9y+z=0求1,x:y:z 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:2X 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 已知x+y+z=0求证x*x*x+y*y*y+z*z*z=3xyz 已知条件 x=9 y=6 x-y=3,(x-y)+(y-z)+(z-x)=10,请问z等于多少? X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z 已知实数x,y,z满足x+y=5,z^2=xy+y-9,那么x+2y+3z=?我很着急 已知实数x,y,z,满足x+y=5,z²=xy+y=9,求x+2y+3Z的值 已知实数x.y.z满足x+y=5及z的2次方=xy+y-9则x+2y+3z=? 已知实数x,y,z满足x+y=5,z^2=xy+y-9,那么x+2y+3z=? 已知实数x、y、z满足x＋y=5,z的平方=xy+y-9,那么x+2y+3z=( ) 已知x,y,z满足x+y=5,z^2=xy+y-9 求x+2y+3z的值 已知实数x,y,z满足x-y=5,z^2=-xy-y-9,求x-2y+3z的值 已知x y z 满足x+y=5,z²=xy+y-9,求x+2y+3z的值 已知x:y=2:3,y:z=9:10,且x+y+z=50,则xyz=? 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