Resposta:
[tex]b) (\: 5 \times 2 = 10 \: )\ (3 \times 2 = 6 \: ) \: 10 + 6 = 16 \\ \\ c)2.5 \times 2 = 5) \: 3 .5\times 2 = 7)7 + 5 = 12[/tex]
