x、y、z满足3x+2y+z=5,2x+y-3z=1.（1）用含X的代数式分别表示X、Y（2）若X是非负数,求Z的取值范围；（3）若Y是非负数,求Z的取值范围.

已知z、y、z同时满足x+3y-5z=0,2x-y-3z=0,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,y,z,满足2/x=3/(y-z)=5/(z+x),则(5x-y)/(y+2z)的值为多少? 已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x：y：z的值 若x,y,z,满足3x+2y+z=5,2x+y-3z=1.y是非负数.求z的取值范围 方程组x+3y-z=17 2x-y+z=16中的y、z同时满足y=z+2,求x、y、z.急! 已知x,y,z满足2/x=3/y-z=5/z+x,则5x-y/y+2x的值快快 已知x,y,z满足方程组：4x-5y+2z=o;x+4y-3x=0,求x:y:z的值 x/2=y/3=z/5 x+3y-z/x-3y+z 已知x,y,z,满足方程组x-2y+z=0,7x+4y-5z=0 已知x,y,z满足方程组x-2y+z=0 7x+4y-5z=0,且z不等于0,2x²-3y²+z²/y²-2z²的值为? 若X.Y.z满足2X+3Y+z=18,4X-3Y+5z=24,求X+3Y的值 已知x、y、z满足方程组：x+y-z=6；y+z-x=2；z+x-y=0 求x、y、z的值 已知X.Y.Z满足方程组,X+y-Z=6y+z-x=2z+x-y=0求X.Y.Z的值 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 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/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..