Question

Calcule as expressões
a) 12-5: (-4/3)=
b) 4/7+5/7
c) 8/3-1/3
d) 3/2+6/5
e) 7/4+7/6=

Answer 1

a) 12 -5 : (-4/3)= mmc 3
     36/3 -15/3 : -4/3 =
     36 -15 : -4 / 3 =
     36 -15 . -3/4 =
     36 +45/4 =
     81/4 ou 20,25
    

b) 4/7 + 5/7 =
    9/7

c) 8/3 - 1/3 =
    8 -1 / 3 =
    7/3

d) 3/2+6/5  mmc 10
    15/10 + 12/10 =
    27/10

e) 7/4 + 7/6 = mmc12
    21/12 + 14/12 =
    21 + 14/12 = 
    35/12