Resposta:
[tex]10 \\ [/tex]
Explicação passo-a-passo:
[tex]30a \times 5b \times 4 \div (10a \times 3b \times 2) \\ 30a \times 5b \times 4 \div (60ab) \\ \\ \frac{30a \times 5b \times 4}{60ab} \\ \\ \frac{30 \times 5b \times 4}{60b} \\ \\ \frac{30 \times 5 \times 4}{60} \\ \\ \div 30 \\ \\ \frac{5 \times 4}{2} \\ \\ \div 2 \\ \\ 5 \times 2 \\ = 10[/tex]
[tex]\Large\mathscr{\red{Attard}}[/tex]
