如果a/(b+c+d)=b/(a+c+d)=c/(a+b+d)=d/(a+b+c)=k,求k的值

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如果a/(b+c+d)=b/(a+c+d)=c/(a+b+d)=d/(a+b+c)=k,求k的值如果a/(b+c+d)=b/(a+c+d)=c/(a+b+d)=d/(a+b+c)=k,求k的值如果a/

如果a/(b+c+d)=b/(a+c+d)=c/(a+b+d)=d/(a+b+c)=k,求k的值
如果a/(b+c+d)=b/(a+c+d)=c/(a+b+d)=d/(a+b+c)=k,求k的值

如果a/(b+c+d)=b/(a+c+d)=c/(a+b+d)=d/(a+b+c)=k,求k的值
a/(b+c+d)=b/(a+c+d)=c/(a+b+d)=d/(a+b+c)=k
a=k(b+c+d)
b=k(a+c+d)
c=k(a+b+d)
d=k(a+b+c)
4个相加得
a+b+c+d=3k(a+b+c+d)

k=1/3

由题知有a/(b+c+d)=b/(a+c+d)=c/(a+b+d)=d/(a+b+c)=k
故得a=k(b+c+d)
b=k(a+c+d)
c=k(a+b+d)
d=k(a+b+c)
4式相加得a+b+c+d=3k(a+b+c+d)
当a+b+c+d不等于0时,k=1/3;
当a+b+c+d=0时,k为任意实数。