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About 【solve the proportion】
不論用哪種計算方法,核心是等價。

等比例放大,等比例縮小,
以既定單位等比例要求分子分母。

#從頭學數學
與其說是計算方法,更準確或者另一個角度切入地說,
不論用哪個認知思路,通向解決問題的,在於等價。

是的,從另一個角度切入, 亦即用數和代數去認知世界,這就是我之緣何從頭重新學習數學。
曾跟教授小學數學、中學數學的朋友還有朋友同事聊中小學數學有什麼用,
“去菜場買菜或許用得著代數計算,但微積分呢,生活中有用得著微積分的地方嗎?”

今天回想起,真是蠢透。
問出這個問題的我,根本、完全不認識數學。
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