数学计数问题.

👨🏻‍🏫 學術台數學

[匿名]

2013-07-19 3:13 am

我有一题数学不会计,[29x59]+72-31

回答 (5)

成

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

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fighting gravity

2013-07-22 2:52 am

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

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[匿名]

2013-07-19 10:13 pm

[29x59]+72-31

=1711+72-31

=1783-31

=1752

參考: 自己

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[匿名]

2013-07-19 5:44 am

(29x59)+72-31

=1711+72-31

=1783-31

=1752

參考: me

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[匿名]

2013-07-19 3:56 am

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

參考: myself

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