Re: [請益] 國中資優數學題

作者: YaDianNa (小雅)   2015-12-18 10:16:27
a+b+c=7 a=7-b-c b=7-a-c c=7-a-b
(7-a-b)/(a+b) +(7-b-c)/(b+c) +(7-a-c)/(a+c)
=7((1/a+b)+(1/b+c)+(1/c+a))-((a+b)/(a+b)+(b+c)/(b+c)+(c+a)/(c+a))
=10-1-1-1=7
作者: math999 (獲得人心)   2015-12-18 20:08:00
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