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E urgente

4. Resolva

a) (-5)+(-8)
b) (-9)+(+7)
c) 21-30
d) 45-52
e) 8-70
1) 55-47
8) (-17)-(-17)​


E Urgente 4 Resolvaa 58b 97c 2130d 4552e 8701 55478 1717 class=