Question

Calcule em seu caderno o valor das expressões

a) ( 2 - 1 / 2)². (1 - 2/5)

b) (3/4 + 1/2) : (1 1/2 - 3/4)

Answer 1

a)
$(2 - \frac{1}{2} ) {}^{2} \times (1 - \frac{2}{5} ) \\ ( \frac{3}{2} ) {}^{2} \times \frac{3}{5} \\ \frac{9}{4} \times \frac{3}{5} \\ \frac{27}{20}$


b)
$( \frac{3}{4} + \frac{1}{2} ) \div ( \frac{11}{2} - \frac{3}{4} ) \\ \frac{5}{4} \div \frac{19}{4} \\ \frac{5}{4} \div \frac{4}{19} \\ 5 \times \frac{1}{19} \\ \frac{5}{19}$