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The digit sequence 123456789
作者:
spkwan
主題:
算術
Insert plus/minus sign(s) in between the digit sequence yielding an arithmetic expression equal/closest to ...
GeoGebra
Reference 1: cut-the-knot
https://www.cut-the-knot.org/do_you_know/digits.shtml
Reference 2: world of numbers
http://www.worldofnumbers.com/ninedig1.htm
Reference 3: nrich
https://nrich.maths.org/1013
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