若|X+3|+|Y+4|+|Z-5|=0,求代数式z的立方-y的平方+x的值

若xyz≠0且4(x/z)-5(y/z)=-2,(x/z)+4(y/z)=3,求x:y:z 1.若3x-2y+z=2;3x+2y+5z=4,求x+22.若x-3y+z=0;3x-3y-4z=0,求x:y:z 若|x-3|+|y+4|+z-5|=0,求代数式x+y-z的值 三元一次方程组题目x+y-z=11 y+z-x=5 x-y+z=1x+y=4 y+z=3 x+z=5若已知x-3y+2z=0 2x+3y-8z=0, 且xyz≠0,则x:y:z= 若x+2y-9z=0,x-2y+5z=0,(x.y.z≠=0)求2x平方+3y平方+7z平方/x平方-4y平方+4z平方 若2x+5y+4z=0 ,3x+y=0；则x+y-z=? 已知：4x-5y+2z=0 x+4y-3z=0则：(x*x+y*y+z*z)/(x*y+y*z+z*x)=____. 若{x-3y+z=0,3x+3y-4z=0,则x:y:z=? 已知{x-5y+2z=0 3x-5y-4z=0,求x：y:z 5x+4y+z=0 3x+y-4z=11 x+y+z= -3 已知x+4y-3z=0,4x-5y+2z=0,则x：y：z 若3x+7y+z=5,4x+10y+z=3,则x+y+z=? 若x/2=y/3=z/4,则3x-2y+5z/x+y+z= 5x+4y+z=0 3x+y-4z=13 x+y+z=—2 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值 X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21 2x+3y-z=9,x+y+z=15,5x-4y-z=0