Question

I) Calcule o valor das seguintes expressões :


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


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


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


4) ( 9 - 4 + 2 ) - 1 + ( 9 + 5 - 3) =


5) 18 - [ 2 + ( 7 - 3 - 8 ) - 10 ] =


6) -4 + [ -3 + ( -5 + 9 - 2 )] =

7) -6 - [10 + (-8 -3 ) -1] =


8) -8 - [ -2 - (-12) + 3 ] =


9) 25 - { -2 + [ 6 + ( -4 -1 )]} =


10) 17 - { 5 - 3 + [ 8 - ( -1 - 3 ) + 5 ] } =


11) 3 - { -5 -[8 - 2 + ( -5 + 9 ) ] } =


12) -10 - { -2 + [ + 1 - ( - 3 - 5 ) + 3 ] } =


13) { 2 + [ 1 + ( -15 -15 ) - 2] } =


14) { 30 + [ 10 - 5 + ( -2 -3)] -18 -12} =


15) 20 + { [ 7 + 5 + ( -9 + 7 ) + 3 ] } =


16) -4 - { 2 + [ - 3 - ( -1 + 7) ] + 2} =


17) 10 - { -2 + [ +1 + ( +7 - 3) - 2] + 6 } =


18) -{ -2 - [ -3 - (-5) + 1 ]} - 18 =


19) -20 - { -4 -[-8 + ( +12 - 6 - 2 ) + 2 +3 ]} =


20) {[( -50 -10) + 11 + 19 ] + 20 } + 10 =

​

Answer 1

Resposta:

Explicação passo-a-passo:

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

15-1+3

14+3

= 17

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

25-(3+6) - (7-8)

25- (+6)-(-1)

25-6+1

19+1

= 20

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

8-3+(15-5)

8-3+(+10)

8-3+10

5+10

=15

4) ( 9 - 4 + 2 ) - 1 + ( 9 + 5 - 3) =

(5+2)-1+(14-3)

7-1+11

6+11

=17

5) 18 - [ 2 + ( 7 - 3 - 8 ) - 10]  =

18-[2+(4-8)-10]

18-[2+(-4)-10]

18-[2-4-10]

18-[-2-10]

18-[-12]

18+12

=30

6) -4 + [ -3 + ( -5 + 9 - 2 )] =

-4+ [ -3+(4-2 )]

-4+ [-3+6 ]  

-4+[+3 ]

-4+3

= -1

7) -6 - [10 + (-8 -3 ) -1] =

-6-[10 + (-11 ) -1]

-6-[10-11 -1]

-6-[-1-1]

-6-[-2]

-6+2

= -4

8) -8 - [ -2 - (-12) + 3 ] =

-8- [ -2 +12+3 ]

-8- [10+3 ]

-8- [ 13]

-8-13

= -21

9) 25 - { -2 + [ 6 + ( -4 -1 )]} =

25- { -2 + [ 6 + ( -5 )]}

25- { -2+6-5}

25- {4-5}  

25-{-1}

25+1

= 26

10) 17 - { 5 - 3 + [ 8 - ( -1 - 3 ) + 5 ] } =

11) 3 - { -5 -[8 - 2 + ( -5 + 9 ) ] } =

12) -10 - { -2 + [ + 1 - ( - 3 - 5 ) + 3 ] } =

13) { 2 + [ 1 + ( -15 -15 ) - 2] } =

14) { 30 + [ 10 - 5 + ( -2 -3)] -18 -12} =

15) 20 + { [ 7 + 5 + ( -9 + 7 ) + 3 ] } =

16) -4 - { 2 + [ - 3 - ( -1 + 7) ] + 2} =

17) 10 - { -2 + [ +1 + ( +7 - 3) - 2] + 6 } =

18) -{ -2 - [ -3 - (-5) + 1 ]} - 18 =

19) -20 - { -4 -[-8 + ( +12 - 6 - 2 ) + 2 +3 ]} =

20) {[( -50 -10) + 11 + 19 ] + 20 } + 10 =

​