Question

resolva as expressões

Answer 1

a não aparece
b
4/3 - ( 1/3 + 2/5) = 
1/3 + 2/5 =
mmc 15
( 5 + 6)/15 = 11/15
4/3 - 11/15 =
mmc = 15
( 20 - 11)/15 = 9/15 = 3/5 ****
c
3/2 - ( 1/2+ 5/6 )
1/2 + 5/6 =
mmc = 6
( 3 + 5)/6 = 8/6 = 4/3 
3/2 - 4/3 =
mmc = 6
( 9 - 8)/6 = 1/6***
d
( 1/1 - 3/5 + 1/6 ) + ( 7/5 + 1/2)
1/1 - 3/5 + 1/6  =
mmc 6 e 5 = 30
( 30 - 18 + 5 )/30  = 17/30  *** primeiro parenteses ***

7/5 + 1/2  =
mmc = 10
( 14 + 5)/10 = 19/10 *** segundo parenteses ***
17/30 + 19/10 =
mmc = 30
( 17 + 57)/30 = 74/30  = 37/15 = 2 inteiros 7/15 ***
nota :  37: 15 = 2 e resta  7