Question

Efetue
A) (+3/5)+(+1/2)=
B)(-2/3)+(+5/4)=
C)(-2/5)-(-1/4)=
D)(-1/2)-(+5/8)=

Answer 1

A) (+3/5)   + (+1/2)=    mmc 10
      2.3/10 + 5.1/10 =    
      6 + 5/10 =
      11/10

B) (-2/3)    + (+5/4)=    mmc 12
     4.-2/12 + 3.5/12 = 
     -8 + 15/12 =
     +7/12 

C) (-2/5)    - (-1/4)= mmc 20
     2.-2/10 - 5.-1/10 =
     -4 +5/10 =
     +1/10
  
D) (-1/2)-(+5/8)=       mmc 8
     4.-1/8 - 1.5/8 =
     -4 -5/8 =
     -9/8

Answer 2

As respostas
A = 11/10
B = 7/12
C = 13/20
D = 17/40