Question

ex. 16 17 si 18
repede pls
dau multe puncte plus coroana
urgenttt

Answer 1

ai rezilvarea la toate exercitiilr aicea

Answer 2

Răspuns

Explicație pas cu pas:

16) a)  

a = ( + 5 ) - [ - 7 - ( - 2 ) ]

a = 5 - ( - 7 + 2 )

a = 5 - ( - 5 )

a = 5 + 5

a = 10

b = ( + 5 ) - ( - 7 ) + ( - 2 )

b = 5 + 7 - 2

b = 12 - 2

b = 10

=>   a = b = 10

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b)

a = ( - 10 ) - [ - 10 - ( - 10 ) ]

a = - 10 - ( - 10 + 10 )

a = - 10 - 0

a = - 10

b = ( - 10 ) - ( - 10 ) + ( - 10 )

b = - 10 + 10 - 10

b = - 10

=>   a = b = - 10

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c)

a = ( - 15 ) - [ + 6 - ( - 21 ) ]

a = - 15 - ( 6 + 21 )

a = - 15 - 27

a = - 42

b = ( - 15 ) - ( + 6 ) + ( - 21 )

b = - 15 - 6 - 21

a = - 21 - 21

a = - 42

==>   a = b = - 42

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d)

a = ( + 5 ) - [ - 5 - ( - 7 ) ]

a = 5 - ( - 5 + 7 )

a = 5 - ( + 2 )

a = 5 - 2  

a = 3

b = ( + 5 ) - ( - 5 ) + ( - 7 )

b = 5 + 5 - 7

b = 10 - 7

b = 3

==>    a = b = 3

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17).

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

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( - 8 ) + ( + 5 ) + a = - 7

- 3 + a = - 7

a = - 7 - ( - 3 )

a = - 7 + 3

a = - 4

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( + 3 ) + b + ( - 10 ) = - 7

b = - 7 + 10 - 3

b = 3 - 3

b = 0

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+ 5 + 0 + c = - 7

c = - 7 - 5

c = - 12

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- 4 + ( - 10 ) + d = - 7

- 14 + d = - 7

d = - 7 + 14

d = 7

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b)   a + b + c + d = - 4 + 0 + ( - 12 ) + 7= - 16 + 7 = - 9

- 8 + b + d = - 8 + 0 + 7 = - 1

a + b + ( - 2 ) = - 4 + 0 - 2 = - 6

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19)

- 6 =( - 10) - ( - 4 ) = - 10 + 4 → diferenta a doua numere intregi negative

- 6 = ( + 2 ) - ( + 8 ) = 2 - 8 → diferenta a doua numere intregi pozitive

- 6 = ( - 5 ) - ( + 1 ) = - 5 - 1 → diferenta a doua numere intregi cu semne contrare