若x:y=0.5:0.8 y:z=1.2:0.5 则x:y:z

若x:y=0.5:0.8 y:z=1.2:0.5 则x:y:z 若z分之x+y+z=y分之x-y+z=x分之-x+y+z,求xyz分之(x+y)(y+z)(z+x) (x+y-z)(x-y+z)= 若x+y+z=3y=2z,则x/x+y+z=? 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)= X+Y+Z=? x/y=(x+z)/(y+z)y/z=(x+y)/(x+z) 若xy-z=0,且(y+x)/x=(z+x)/y=(y+x)/z,求[(y+z)(z+x)(x+y)]/xyz的值? 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? 已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=? 若X/10=Y/8=Z/9则X+Y+Z/Y+Z=? 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? 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,且满足(y+z)/x=(x+z)/y=(x+y)/z,求（y+z)（x+z)（x+y)/xyz的值 若(x+y)/z=(y+z)/x=(x+z)/y 求（x+y-z)/(x+y+3z)的值 (y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值 x=y; y=z; z=x/y 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)=