Question

Calcule as expressões numéricas abaixo em cada item. a)2/5 + 4/5 - 1/5= B)2/5 + 3/10= c)2/4 + 1/6 - 3/8= d)2/3 + 1/5=

Answer 1

a)

$\frac{2}{5} + \frac{4}{5} - \frac{1}{5} = \frac{6}{5} - \frac{1}{5} = \frac{5}{5} = 1$

b)

$\frac{2}{5} + \frac{3}{10} = \frac{4}{10} + \frac{3}{10} = \frac{7}{10}$

c)

$\frac{2}{4}+\frac{1}{6}-\frac{3}{8}=\frac{12}{24}+\frac{4}{24}-\frac{9}{24}$

$= \frac{16}{24} - \frac{9}{24} = \frac{7}{24}$

d)

$\frac{2}{3} + \frac{1}{5} = \frac{10}{15} + \frac{3}{15} = \frac{13}{15}$