Question

efetue as multiplicações a) (-4/5) • (-7/4) b) (-4/9) • (-16/81) c) (+5/8) • (-4/3) d) (+4/5) • 0​

Answer 1

$a) -\dfrac{4}{5}\cdot \bigg(-\dfrac{7}{4} \bigg)=\dfrac{28}{20} =\dfrac{7}{5} \\\\b)-\dfrac{4}{9}\cdot \bigg(-\dfrac{16}{81} \bigg)=\dfrac{64}{729} \\\\c)\dfrac{5}{8}\cdot \bigg(-\dfrac{4}{3} \bigg)=-\dfrac{20}{24} =-\dfrac{5}{6}\\\\d)\dfrac{4}{5}\cdot0=0$

Answer 2

Explicação passo-a-passo:

A)

$- \dfrac{4}{5} \times - \dfrac{7}{4}$

$\dfrac{28}{20}$

$\dfrac{28 {}^{ \div 4} }{20 {}^{ \div 4} }$

$\dfrac{7}{5}$

B)

$- \dfrac{4}{9} \times - \dfrac{16}{81}$

$\dfrac{64}{729}$

C)

$\dfrac{5}{8} \times - \dfrac{4}{3}$

$- \dfrac{20}{24}$

$- \dfrac{20 {}^{ \div 4} }{24 {}^{ \div 4} }$

$- \dfrac{5}{6}$

D)

$\dfrac{4}{5} \times 0$

$0$