已知x+y=8,y+z=12,x+z=10,则x+y+z=?
(x+y-z)(x-y+z)=
已知x+y-z/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz
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)
X+Y+Z=?
若{x+3y+10z=0 则 (x+y-z)/(x-y+z)
已知:(x+y)/z=(x+z)/y=(z+y)/x,且xyz不等于0,则分式(x+y)(x+z)(z+x)/xyz的值
已知x,y,z满足x/(y+z)+y/(z+x)+z/(x+y)=1,求代数式x2/(y+z)+y2/(x+z)+z2/
已知实数x,y,z满足x/(y+z)+y/(z+x)+z/(x+y)=1,求x2/(y+z)+y2/(z+x)+z2/(
已知 x/(y+z)+y/(z+x)+z/(x+y)=1
已知X+Y=12 Y+Z=10 求X Y Z各等于几
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)