Question

Calcule as expressões

A) 6+7\8 :21/4-5/3

B) 1/7-49/27: (7/3)3

Answer 1

a)
$\frac{1}{6} + \frac{7}{8} \div \frac{21}{4} - \frac{5}{3} \\ \\ \frac{1}{6} + \frac{7}{8} \times \frac{4}{21} - \frac{5}{3} \\ \\ \frac{1}{6} + \frac{1}{2} \times \frac{1}{3} - \frac{5}{3} \\ \\ \frac{1}{6} + \frac{1}{6} - \frac{5}{3} \\ \\ - \frac{4}{3}$


b)

$\frac{1}{7} - \frac{49}{27} \div ( \frac{7}{3} )^{3} \\ \\ \frac{1}{7} - \frac{7^{2} }{3 ^{3} } \div \frac{7^{3} }{3 ^{3} } \\ \\ \frac{1}{7} - \frac{7^{3} }{3^{3} } \times \frac{3^{3} }{7^{3} } \\ \\ \frac{1}{7} - \frac{1}{7} \\ \\ 0$