Question

efetue as adições e subtrações a seguir em seu caderno.

a) 4/7 + 2/7

b)8/5 - 3/5

c) 3/10 + 1/4

d) 4/5 - 2/3

e)5/8 - 1/4

f) 1 1/4 + 2 1/6

g) 1 3/10 - 8/9

h) 3/25 + 2/5

i) 3/4 + (4/5 - 3/10)

j) 5/8 - 3/8 - 1/8

Answer 1

a) 4/7 + 2/7= 6/7
b) 8/5 - 3/5= 5/5= 1
c) 3/10 + 1/4 = (12 + 10)/40= 22/40= 11/20
d) 4/5 - 2/3= (12 - 10)/15= 2/15
e)5/8 - 1/4= 5/8 - 2/8 = 3/8
f)11/4 + 21/6 = (66 + 84)/24 = 150/24= 25/4
g) 13/10 - 8/9 = (117 - 80)/ 90= 37/90
h) 3/25+ 2/5= 3/25 + 10/25= 13/25
i)3/4 + (4/5 - 3/10)
3/4 + 5/10= 3/4 + 1/2= 3/4 + 2/4 = 5/4
j)5/8 - 3/8 -1/8= ( 5 - 3 - 1)/8 = 1/8

espero ter ajudado