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在我看來古人隻是給出兩種方法計算出弦長c
-haobuhao-
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(1036 bytes)
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03/19/2019 postreply
23:09:54
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沒搞懂,公式裏並沒涉及負數啊,隻是有a-a得0,或2a-2a=0,進而ab-ab得0。
-軍事調色板-
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03/21/2019 postreply
00:33:32
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這是現代標準的證明方法,與所標尺寸無關。西方有書為證的詳細證明一樣很晚才有,隻是托為古人所著。
-lidongmei-
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03/20/2019 postreply
20:49:43
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