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速算 - 各種小撇步 | Penana
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速算
ISSUE #16
Author: MR.writer
速算
Author: MR.writer
ISSUE #16
各種小撇步
No Plagiarism!vKjM5G1xvepqOqdCvddHposted on PＥNAＮＡ

667732732667796509de004.91503070-176077.png上面這招雖然不一定比較快，但卻比較順，原先寫直式，還要進位退位容易出錯。現在直接兩數各自加或減相同的數字

記住，只有減法能用這招！！！

1341410706677966d98a8f9.93591419-176077.png解釋一下：因為x25=x100÷​​​​​​​4，所以之後只要加00再除4即可。

491277736677967b629b41.34715964-176077.png同理/25也是相同道理：/25=x4÷100，所以之後只要乘4在將小數點左移兩位即可。

接著來看看0.25

1387656407667796845f94c1.43906144-176077.png

x0.25=x25÷100=÷4

÷0.25=x100÷25=x4

158861731566779692f1aa84.56392928-176077.png照上述方式操作即可：至於為何axb%=bxa%在後方會證明

最後來練習幾題看看：4671463466677969b839b07.26710529-176077.png

答案在下方

328Please respect copyright.ＰＥＮＡＮＡTov7mv9Xpi

328Please respect copyright.ＰＥＮＡＮＡnOHBpgHTKD

328Please respect copyright.ＰＥＮＡＮＡD0UgT5jOVS

1577003855667796aa30a372.35410495-176077.png

你答對了嗎？若有不清楚的地方歡迎在留言區詢問

證明時間：

1629237212667796b92b3900.50427654-176077.png328Please respect copyright.ＰＥＮＡＮＡIEFVwqcKTN

最後總複習一下：

1495040830667796d02a1503.21057427-176077.png

OK今天學玩了幾個偷吃步的技巧，下次見！！！

216.73.217.128

ns216.73.217.128da2
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速算
Article
Short Story
Last updated: Aug 22, 2024
Total word count: 9,813
Total reading time: 33 Minutes
Writer:
MR.writer
數學 mr.writer 心算 速算
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