Question

Efetue as adições e subtrações com números inteiros​

Answer 1

Resposta:

Explicação passo-a-passo:

$a)\\\frac{2}{5}+(-\frac{1}{3})= \frac{2}{5}-\frac{1}{3}=\frac{6-5}{15}=\frac{1}{15}\\\\b)\\-0,4+(-2,8)=-0,4-2,8=\frac{2}{5}- \frac{14}{5}=\frac{12}{5} \\\\c)\\-\frac{5}{8} -(+\frac{3}{8})=-\frac{5}{8} -\frac{3}{8}=\frac{-5-3}{8}=-\frac{8}{8} =-1\\\\d)\\ \frac{2}{5}-(+\frac{1}{4})=\frac{2}{5}-\frac{1}{4}=\frac{8-5}{20}=3/20\\\\e)\\-0,54-(-0,6)=-0,54+0,6=\frac{27}{50}+\frac{3}{5}=\frac{27+30}{50} =\frac{57}{50}\\\\f)\\-\frac{1}{4}-3,8=-\frac{1}{4}-\frac{19}{5} =\frac{-5-76}{20}=-\frac{81}{20}$