Question

valendo 59 pontos!! mandem o foto do cálculo,pfvv (tenho que entregar hoje!!)

Answer 1

Explicação passo-a-passo:

$d)( \frac{3}{4} + \frac{1}{2} ) \div (2 - \frac{1}{4} ) = ( \frac{3 + 2}{4} ) \div ( \frac{8 - 1)}{4} ) = \frac{5}{4} \div \frac{7}{4} = \frac{5}{4 } \times \frac{4}{7} = \frac{20}{28} = \frac{5}{7}$

$e)( \frac{2}{5} \times (2 - \frac{3}{4} ) \div ( \frac{1}{2} ) {}^{2} = ( \frac{2}{5} \times ( \frac{5}{4} ) \div ( \frac{1}{4} ) = \frac{10}{20} \div \frac{1}{4} = \frac{1}{2} \times 4 = \frac{4}{2} = 2$