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1  | 如圖甲乙丙為全路 積甲丁戊積為三分之二戊丁乙丙積為三分之一甲乙為共時丁乙 為一秒甲乙丙積與甲丁戊積比若三與二比甲乙丙積與甲丁戊積比 又若甲乙方與甲丁方比即三與二比若甲乙方與甲丁方比亦即三方根 與二方根比若甲乙與甲丁比故三方根二方根較與三方根比若甲乙甲 丁較之丁乙一秒與甲乙共時比 |
| 2 | 有一其最遠 界二十里移於高山頂高出平地四十里下測一敵營須用四十五度方向 方能及之求營距若干遠 |
| 3 | 王宗福 |
| 4 | 答曰四十里 |
URN: ctp:ws357952
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