Question

Alguém me ajuda a fazer essa conta?

Answer 1

Olá, jovem!

$37-) \\ \\ a) \: ( - \frac{8}{9} ) \times ( + \frac{4}{3} ) \times ( - \frac{ 9}{16} ) \\ = \frac{2}{3} = 0,6666... \\ \\ \\ b) \: ( - 0,2) \times ( - \frac{5}{4} ) \times ( - 2 \frac{1}{3} ) \\ ( - \frac{2}{10} ) \times ( - \frac{5}{4} ) \times ( -( \frac{6}{3} + \frac{1}{3}) ) \\ ( - \frac{1}{5} ) \times ( - \frac{5}{4} ) \times ( - \frac{7}{3} ) \\ = - \frac{7}{12} = - 0,58333... \\ \\ \\ c) \: ( + \frac{28}{45} ) \times ( - \frac{25}{14} ) \\ ( + \frac{2}{9}) \times ( - \frac{5}{1} ) \\ = - \frac{10}{9} = - 1,1111... \\ \\ \\ \ \ \\ 38 - ) \\ \\ a) \: ( - \frac{2}{3} ) \div ( - \frac{10}{21} ) \\ ( - \frac{2}{3} ) \times ( - \frac{21}{10} ) \\ = \frac{7}{5} = 1,4 \\ \\ \\ b) \: ( - \frac{7}{5} ) \div ( + \frac{49}{10} ) \\ ( - \frac{7}{5} ) \times ( + \frac{10}{49} ) \\ = - \frac{2}{7} = - 0,28571428... \\ \\ \\ c) \: ( \frac{5}{3} ) \div ( - \frac{3}{5} ) \\ ( \frac{5}{3} ) \times ( - \frac{5}{3}) \\ = \frac{ - 25}{9} = - 2,777... \\ \\ \\ d) \: ( \frac{1}{4} \div \frac{1}{8} ) \div \frac{12}{5} \\ ( \frac{1}{4} \times \frac{8}{1} ) \times \frac{5}{12} \\ \frac{2}{1} \times \frac{5}{12} = \frac{5}{6} = 0,8333...$

Qualquer coisa, é só perguntar!