Question

expressão:
a)
$\frac{5}{7 } + \frac{8}{7} - ( \frac{3}{7} + \frac{6}{7} - \frac{1}{7} ) =$
b)
$\frac{3}{2} + ( \frac{3}{2 } + \frac{5}{2} ) - ( \frac{2}{2 } + \frac{5}{2} ) =$
c)
$0 .5 - ( \frac{1}{3} + \frac{1}{5} ) =$
d)
$\frac{2}{7 } + ( - 0.2 + \frac{3}{10} ) =$
me ajudem

Answer 1

a) 5/7 + 8/7 - ( 3/7 + 6/7 - 1/7 ) =
5/7 + 8/7 - 3/7 - 6/7 + 1/7 =
14/7 - 9/7 =
5/7

b) 3/2 + (3/2 + 5/2) - (2/2 + 5/2) =
3/2 + 8/2 - 2/2 - 5/2 =
10/2 - 7/2 =
3/2

c) 0,5 - (1/3 + 1/5) =
1/2 - 1/3 - 1/5 =
15/30 - 10/30 - 6/30 =
15/30 - 16/30 =
-1/30

d) 2/7 + ( -0,2 + 3/10) =
2/7 + ( -2/10 + 3/10) =
2/7 + ( 1/10 ) =
2/7 + 1/10 =
20/70 + 7/70 =
27/70

Bons estudos! :)