Terentius, Johannes; Zheng, Wang 王徴
,
Yuan xi qi qi tu shuo lu zui 遠西奇器圖說錄最
,
[1830]
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<
s
id
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N119EA
"> 第六十一款 有兩體,已有其重,已有其大之比率,
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求本重之比率。</
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N119EF
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<
s
id
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N119F4
"> 假如a、e兩重為六與四,其大比率
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為三倍,要求銀與金之比率。</
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<
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N119F9
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<
s
id
="
N11A00
"> 法曰:以兩所有之數,用乂字架相乘,
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則兩者之比率為本重之比率。</
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<
s
id
="
N11A05
">六、一
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lb
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相乘得六,其四、三相乘為十二。</
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>
<
s
id
="
N11A0A
">所以
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lb
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有六與十二之比率,約之,則為二分
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lb
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之一也。</
s
>
<
s
id
="
N11A11
">故銀體之輕與金體相比,則
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lb
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</
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</
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</
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