Resposta:
1- a)
\frac{5}{7} - \frac{2}{3} = \frac{3}{4}
7
5
−
3
2
=
4
3
b)
\frac{2}{3} - \frac{1}{2} = \frac{1}{1}
3
2
−
2
1
=
1
1
c)
\frac{2}{3} - \frac{4}{5} = \frac{2}{2}
3
2
−
5
4
=
2
2
d)
( - \frac{7}{8}) + ( - \frac{3}{4}) = - \frac{10}{12}(−
8
7
)+(−
4
3
)=−
12
10
e)
( - \frac{2}{5}) + ( - \frac{1}{4} ) = - \frac{3}{9}(−
5
2
)+(−
4
1
)=−
9
3
f)
( - \frac{1}{2} ) + ( - \frac{5}{8} ) = - \frac{6}{10}(−
2
1
)+(−
8
5
)=−
10
6
g)
\frac{2}{3} + \frac{1}{5} = \frac{3}{8}
3
2
+
5
1
=
8
3
h)
( - \frac{2}{5} ) + ( \frac{1}{2} ) = - \frac{1}{3}(−
5
2
)+(
2
1
)=−
3
1
espero ter ajudado um pouco
Explicação passo-a-passo:
ESPQRO TER AJUDADO ♡♡
