Question

Calcule as seguintes multiplicações:

a) 1/4 × 2/5 =

b) 5/3 × 4/7 =

c) (0,9) × (0,5) =

d) 1,4 × (-2) = ​

Answer 1

a)

$\frac{1}{4} \times \frac{2}{5} = \frac{1 \times 4}{4 \times 5} = \frac{4}{20} = \frac{1}{5}$

b)

$\frac{5}{3} \times \frac{4}{7} = \frac{5 \times 4}{3 \times 7} = \frac{20}{21}$

c)

$(0.9) \times (0.5) = 0.45$

d)

$1.4 \times ( - 2) = - 2.8$