Question

1.Calcule as Expressões:

a) + 3,7 - 4,9 =

b) - 1/6 + 9/10 =

c) (- 4,7) - (- 1,6) =

d) 10,8 - (- 5,9) =

2.Determine :

a) (+ 11/4) - (+ 2/3) =

b ) (- 2/5) - ( 3/7) =

c) (- 1/5) - (- 2/10) =

d) ( + 3/6) + (+ 4/8) =]

Answer 1

1)

a)3,7-4,9= -1,2

b)-1/6+9/10= mmc=30

(-5+27)/30=22/30=11/15

c) -4/7+1/6= mmc= 42

(-24+7)/42=-17/42

d)10,8+5,9=16,17

2)

a)11/4+2/3= mmc=12

(33+8)/12=41/12

b)-2/5-3/7= mmc =35

(-14-15)/35=-29/35

c)-1/5+2/10=-1/5+1/5=0

d)3/6+4/8=1/2+1/2=2/2=1