5/1+45/1+117/1+221/1=?

题目详情

▼优质解答

答案和解析

1/5+1/45+1/117+1/221
=4×(1/5+1/45+1/117+1/221)÷4
=(4/5+4/45+4/117+4/221)÷4
=(1-1/5+1/5-1/9+1/9-1/13+1/13-1/17)÷4
=(1-1/17)÷4
=16/17÷4
=4/17
=17分之4

看了 5/1+45/1+117/1...的网友还看了以下：