数学计数问题.

👨🏻‍🏫 學術台數學

2013-07-19 3:13 am

我有一题数学不会计,[29x59]+72-31

回答 (5)

2013-07-19 3:35 am

✔ 最佳答案

(29x59)+72-31
=(30-1)(60-1)
=(30)(60)-60-30+1+72-31
=1800-90+72-30
=1710+42
=1752

參考: 建議用計數機=,= 先乘除,後加減

👍 0 👎 0

fighting gravity

2013-07-22 2:52 am

[29x59]+72-31
=1711+72-31
=1752

👍 0 👎 0

2013-07-19 10:13 pm

[29x59]+72-31

=1711+72-31

=1783-31

=1752

參考: 自己

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2013-07-19 5:44 am

(29x59)+72-31

=1711+72-31

=1783-31

=1752

參考: me

👍 0 👎 0

2013-07-19 3:56 am

[29x59]+72-31
=1711+72-31
=1783-31
=1752

參考: myself

👍 0 👎 0

收錄日期: 2021-04-13 19:34:29
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130718000051KK00321

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