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原文章由 uncleedward 於 07-12-7 10:12 發表
In fact, my solution is pretty standard. It was only that I used "cutting off the rabbits' feet" to make it easier for kids to remember.
For 兩數和差,we have the following formula from most text boo ...
Dear uncleedward,
I am not very good in math, but really feel 一點點通 through your solution, and its very interesting.
Do you have any suggestion of the book name of 九章出版社?
Thank you very much!
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