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| 作者 | 標題: 國小分數資優題 |
| KK |
 發表於: 2021/6/14 下午 07:12:32
若x=1-(1/4)+(1/7)-(1/10)+(1/13)-(1/16)+(1/19)-(1/22) 說明0<x<1 |
| 黛葳 |
 回覆於: 2021/6/15 下午 01:56:32
1-[(1/4)-(1/7)+(1/10)-(1/13)+(1/16)-(1/19)]-1/22 (1/4)-(1/7)>0 (1/10)-(1/13)>0 (1/16)-(1/19)>0 所以1-[(1/4)-(1/7)+(1/10)-(1/13)+(1/16)-(1/19)]-1/22<1 |
| Rita |
回覆於: 2021/6/16 下午 03:12:17
(1/4)-(1/7)<1/4 (1/10)-(1/13)<1/10 (1/16)-(1/19)<1/16 (1/4)-(1/7)+(1/10)-(1/13)+(1/16)-(1/19)<1/4+1/10+1/16=20/80+8/80+5/80=33/80 (1/4)-(1/7)+(1/10)-(1/13)+(1/16)-(1/19)-1/22<33/80-1/40=33/80-2/80=31/88 1-{(1/4)-(1/7)+(1/10)-(1/13)+(1/16)-(1/19)-1/22}>1-31/88>0 |
| KK |
回覆於: 2021/6/16 下午 10:13:57
謝謝黛葳、Rita |
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