Question

Efetue as adições e as subtrações
a) (-2/3) + (+1/4)
b) (-4/7) + (-2/6)
c) (+1/7) - (+1/3)
d) (+2/3) - (+1/3)
e)( -4/5) - (-1/8)
f) (-3/4) -5

Answer 1

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

b) (-4/7) + (-2/6)
-4/7 - 2/6 =
-24/42 - 14/42 =
-24 - 14 = -38

c) (+1/7) - (+1/3)
+1/7 - 1/3 =
+3/21 - 7/21 =
+3 - 7 = -4

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

e)(-4/5) - (-1/8)
-4/5 + 1/8 =
-32/40 + 5/40 =
-32 + 5 = - 27

f) (-3/4) -5
-3/4 - 5/1 =
-3/4 - 20/4 =
-3 - 20 = -23