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) =]
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) =]
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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