Question

d)(-42/15)-(-7/30)=
e)-7/10.1/2:3/5=​

Answer 1

Explicação passo-a-passo:

.

$a)- \dfrac{42}{15} - ( - \dfrac{7}{30} )$

$- \dfrac{42}{15} + \dfrac{7}{30}$

Mmc 30

$- \dfrac{84}{30} + \dfrac{7}{30}$

$- \dfrac{77}{30}$

.

$b) - \dfrac{7}{10} \times \dfrac{1}{2} \div \dfrac{3}{5}$

$- \dfrac{7}{20} \div \dfrac{3}{5}$

$- \dfrac{7}{20} \times \dfrac{5}{3}$

$- \dfrac{35}{60}$

$- \dfrac{35 {}^{ \div 5} }{60 {}^{ \div 5} }$

$- \dfrac{7}{12}$