(100+100)/(100/a+100/b)最好有图

题目详情

(100+100)/(100/a+100/b)
最好有图

▼优质解答

答案和解析

答：
(100+100)/(100/a+100/b)
=200/ [100×(1/a+1/b)]
=2 / (1/a+1/b)
=2 / (b/ab+a/ab)
=2 / [(b+a) /(ab) ]
=2ab /(a+b)

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