利用
a/b=c/d=e/f=(a+c+e)/(b+d+f)=(a+c)/(b+d)
X/Y+Z=Y/X+Z+1=Z/X+Y-1=X+Y+Z
(X+y+z)/(2x+2y+2z-1+1)=X+Y+Z
(x+y+z)/[2(x+y+z)]=x+y+z
x+y+z=1/2
X/Y+Z=Y/X+Z+1=Z/X+Y-1=X+Y+Z,求x+y+z等于多少
3个回答
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