mariaanca917
mariaanca917
14-09-2017
Mathematics
contestada
-(-7-9-20)+(-3+11-21)
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choixongdong
choixongdong
14-09-2017
-(-7-9-20)+(-3+11-21)
= 7 + 9 + 20 - 3 + 11 - 21
= 47 - 24
= 23
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