Respostas

2014-02-12T21:21:14-02:00
(20+21:7)x(36:9-1)
=(20+3)x(4-1)
=23x3
=69
2014-02-12T21:39:26-02:00
Olá

 (20+21:7) x (36:9-1)
(20+3).(4-1)
23.3=69
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