x/10=y/8=z/9,求(x+y+z)/(x+y)?第一次问的时候题目抄错了.

若X/10=Y/8=Z/9则X+Y+Z/Y+Z=? X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z x/10 = y/8 =z/9 求x+2y+3z/y-5z 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)=? (y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值 X+Y-Z=15 X+5Y+10Z=70 求：X、Y、Z (x*x+2)(y*y+4)(z*z+8)=64xyz,求x,y,z x/10=y/8=z/9,求(x+y+z)/x+(x+y)?x/10=y/8=z/9,求(x+y+z)/(x+y)？不好意思 解方程组：{x(x+y+z)=6 {y(x+y+z)=9 {z(x+y+z)=10 已知x+y+yz=5,y+z+xy=8,x+z+xy=9,求x,y,z x+y=6,y+z=8,x+z=10求x、y、z的值 x+y=8 y+z=12 x+z=10 x+y+z= x+y=8 y+z=12 x+z=10 x+y+z= 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求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) 已知 (x+y-z)/z=(x-y+z)/y=(y+z-x)/x,且xyz≠0,求代数式 ((x+y)(y+z)(x+z))/xyz x分之y+z=y分之z+x=z分之x+y(x+y+z不等于0）,求x+y+z分之x+y-z 分式加减法：已知x+y/z=x+z/y=y+z/x(x+y+z≠0）,求x+y-z/x+y+z