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Sumas y Restas
Autor :
Freddy Yesid León Riaño
1.
12+4-6+2
2.
40-21+15-14
3.
16-3-8-4+9-2+7
4.
3-1+20-6-10+11+4-5
5.
80-20-10+30+5+15
6.
15-5+25+35-5-5-5
7.
30-8-4+20-19+2-20