若x²-4x+y²+6y+√z-13=0,求(x+y)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.
若xy-z不等于0,且(y+x)/x=(z+x)/y=(y+x)/z,求[(y+z)(z+x)(x+y)]/xyz的值?
若xyz不等于0,且满足(y+z)/x=(x+z)/y=(x+y)/z,求(y+z)(x+z)(x+y)/xyz的值
若xyz不等于0,且(y+z)/x=(z+x)/y=(x+y)/z,求(y+z)(z+x)(x+y)/xyz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
若:X^2-4X+Y+6Y+√ Z-3+13=0求(xy)^z的值
若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值
若x:y:z=3:4:5=6,求x-y+z分之x+y-z的值
已知X Y Z 满足 x-4x+y+6y+√(z+1)+13=0,求代数式 (xy)的值谢谢了,
已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值
若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值
x y z x+y--- = --- = ---- ----y+Z z+x x+y ,求 z 的值 .求 x+y----