S=1-1/3+1/5-1/7+1/9-1/11+1/13-1/15,試說明0小於S小於1?

2017-06-09 8:16 pm
更新1:

數學不等式問題

回答 (1)

2017-06-09 9:21 pm
Sol
S=1-1/2+1/5-1/7+1/9-1/11+1/13-1/15
=(1-1/3)+(1/5-1/7)+(1/9-1/11)+(1/13-1/15)
=2/3+2/35+2/99+2/195
S>0
S=2/3+2/35+2/99+2/195
S<2/3+2/18+2/18+2/18
S<1
0<S<1


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