Question

calcule as somas e subtrações.
a)
$\frac{2}{9} + \frac{3}{4}$
b)
$\frac{2}{5} + \frac{3}{10}$
c)
$2 \frac{1}{4} + \frac{2}{3} + \frac{1}{2}$
d)
$\frac{11}{12} - \frac{5}{6} + \frac{2}{9}$
​

Answer 1

Explicação passo-a-passo:

a)

$\frac{2}{9} + \frac{3}{4} \: mmc \: de \: 9 \: e \: 10 \\ \frac{8+ 27}{36} \\ \frac{35}{36}$

b)

$\frac{2}{3} + \frac{3}{10} \\ \frac{4 + 3}{10} \\ \frac{7}{10}$

c)

$\frac{1}{4} + \frac{2}{3} + \frac{1}{2} \\ \frac{3 + 8 + 6}{12} \\ \frac{17}{12}$

d)

$\frac{11}{12} - \frac{5}{6} + \frac{2}{9} \\ \frac{33 - 30 + 8}{36} \\ \frac{11}{36}$