Question

Alguém me ajuda?
$\frac{1}{2} \times ( \frac{3}{1} - \frac{1}{2} ) \times ( \frac{1}{5} - \frac{4}{1})$
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Answer 1

1/2 × (3 - 1/2) × ( 1/5 - 4)=

1/2 × (6-1/2) × (1-20/5)=

1/2 × 5/2 × ( -19/5)=

5/4 × (-19/5)=

- 19/4