若︱x-2y︱+[3y-2z]2=0,则x+y-2z=多少急

若x+y+z=3y=2z,则x/x+y+z=? 若方程组2x+3y-z=0,x-3y-z=0,则x：y：z=? 若方程组：x+y-2z=0,3x+y-z=0,则x：y：z= 若{x+3y+10z=0 则 (x+y-z)/(x-y+z){2x-y-2z=0 若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=? 若(4x-3y-3z)^2+|x-3y-z|=0 且xyz不等于0 则4x+y-z/x+y+z 的值 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)= 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= X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z 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-2y︱+[3y-2z]2=0,则x+y-2z=多少急 若2x+5y+4z=0 ,3x+y=0；则x+y-z=? 已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 已知：x+2y-3z=0,3x-2y+z=0,则x：y：z= 若x:y:z=3:2:1,则x+2y-z/2x-y+z=