Respostas

2013-06-05T11:45:12-03:00

Primeiro resolvemos oque estiver no parenteses

 

 

1)15-(3-2)+(7-4)

15-2+3

   13+3=16

 

 

2)25-(8-5+3)-(12-5-8)

   25-6-1=18

 

3)(10-2)-3+(8+7-5)

     8-3+10=15

 

Espero que entenda!!

  

6 3 6
2013-06-05T11:53:09-03:00

1) 15-(3-2)+(7-4) =

15 -(1) + (3)=

15 -1 +3 =

18 -1 = 17

 

2) 25-(8-5+3)-(12-5-8) =

25 -(6) -(-1) =

25 -6 +1 =

26 -6 = 20

 

3) (10-2)-3+(8+7-5) =

8 -3 +(15-5) =

8 -3 +10 =

18 -3 = 15

12 4 12