2/3+2/15+2/35+2/63+1/9这道题怎样简算?

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2/3+2/15+2/35+2/63+1/9这道题怎样简算?2/3+2/15+2/35+2/63+1/9这道题怎样简算?2/3+2/15+2/35+2/63+1/9这道题怎样简算?2/3+2/15+2

2/3+2/15+2/35+2/63+1/9这道题怎样简算?
2/3+2/15+2/35+2/63+1/9这道题怎样简算?

2/3+2/15+2/35+2/63+1/9这道题怎样简算?
2/3+2/15+2/35+2/63+1/9 =(1-1/3)+(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+1/9 =1