Question

calcule as adições de frações.
a)(+3/7)+(+2/5)=
b)(-1/6)+(+4/9)=
c)(-5/8)+(-7/4)=

mim ajudem ​

Answer 1

Explicação passo-a-passo:

$a)$

$( + \dfrac{3}{7} ) + ( + \dfrac{2}{5})$

$\dfrac{3}{7} + \dfrac{2}{5}$

$\dfrac{15 + 14}{35}$

$\dfrac{29}{35}$

$b)$

$( - \dfrac{1}{6} ) + ( + \dfrac{4}{9} )$

$- \dfrac{1}{6} + \dfrac{4}{9}$

$\dfrac{ - 3 + 8}{18}$

$\dfrac{5}{18}$

$c)$

$( - \dfrac{5}{8} ) + ( - \dfrac{7}{4} )$

$- \dfrac{5}{8} - \dfrac{7}{4}$

$- \dfrac{5 + 14}{8}$

$- \dfrac{19}{8}$