Question

efetue as adições e subtrações

Answer 1

a) (-2/3) + (1/4) =
= -2.4/12 + 1.3/12 =
= -8/12 + 3/12 =
= -5/12

b) (-4/7) + (-2/6) =
= 6.-4/42 - 2.7/42 =
= -24/42 - 14/42 =
= -38/42 =
= 16/21

c) (1/7) - (1/3) =
= 3.1/21 - 1.7/21 =
= 3/21 - 7/21 =
= -4/21

d) (2/3) - (1/3) =
= (2-1)/3 =
= 1/3