Question

Calcular o valor das expressões numéricas, lembrando a ordem das operações:
a) 1/2 :6 + 5/12=
b) 3/7: (1 - 5/14)=

Answer 1

$a) \\ \frac{1}{2} \div6+ \frac{5}{12} = \\ \\ \frac{1}{2} \times \frac{1}{6} + \frac{5}{12} = \\ \\ \frac{1}{12} + \frac{5}{12} = \\ \\ \frac{1+5}{12} = \frac{6}{12} = \frac{1}{2} \\ \\ \\ b) \\ \frac{3}{7} \div(1- \frac{5}{14} )= \\ \\ \frac{3}{7} \div( \frac{14-5}{14} )= \\ \\ \frac{3}{7} \div \frac{9}{14}= \\ \\ \frac{\not3}{\not7} \times \frac{\not14^2}{\not9_3} = \frac{2}{3}$