快速計算方法

2010-03-21 5:47 pm
5.24*4.25+2.51*1.52=?(不能用計算機or用平常方法)

回答 (1)

2010-03-21 6:53 pm
✔ 最佳答案
(5.24)(4.25) = (5.24)(17/4) = (1.31)(17) = (1.31)(20 -3) = 26.2 - 3.93 = 22.27.
(2.51)(1.52) = (10/4 + 0.01)(1.52) = (10)(0.38) + (0.01)(1.52) = 3.8 + 0.0152
= 3.8152.
so total = 26.0852.


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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100321000051KK00402

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