Question

resolva as adições e as subtrações

a) 2/5 +1/2

b) 5/8 -3/4

c)-1/6 +3/4

d)-2/7-1/6

Answer 1

Resposta:

a) 2/5 +1/2

$mmc=10\\ \\ \frac{4+5}{10} =\frac{9}{10}$

b) 5/8 -3/4

$mmc=8\\ \\ \frac{5-6}{8} =-\frac{1}{8}$

c)-1/6 +3/4

$mmc=12\\ \\ \frac{-4+9}{12} =\frac{5}{12}$

d)-2/7-1/6

$mmc=42\\ \\ \frac{-12-7}{42} =-\frac{19}{42}$