quien me ayuda por fis
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a) 15 - 10 + 7 b) 20 - (5+7)
5 + 7 20 - 12
12 8
c) 10 - 8 + 20 d) 9 + (12 - 2)
2 + 20 9 + 10
22 19
e) 8 x (13 + 15):2
8 x 28 :2
224 : 2
112