Question

Ajuda nessa 2 questão

Answer 1

Resposta:

$A= \frac{2}{3} - \frac{7}{5} => A=\frac{10-21}{15}= -\frac{11}{15}\\\\B=\frac{7}{10}-\frac{77}{99}=>B=\frac{693-770}{990}=-\frac{77}{990}\\\\\frac{A}{B}=>(-\frac{11}{15})*(-\frac{990}{77})=\frac{10890}{1155}\\\\\frac{A}{B}=\frac{726}{77}$

Explicação passo-a-passo: