Question

Calculati : a) -3-[-5+(-2)-(-3+1)]+7 ; b) -[-17+(-23-4)+11]-(-9+2)

Answer 1

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

- 3+5+7=9

b) - (-17-27+11)-(-7)=

-(-44+11)+7= - (-33)+7= 33+7=40

Answer 2

Răspuns:

a ) - 3 - [ - 5 + ( - 2 ) - ( - 3 + 1 ) ] + 7 =

= - 3 - [ - 5 - 2 - ( - 2 ) ] + 7

= - 3 - [ - 7 + 2 ] + 7

= - 3 - ( - 5 ) + 7

= - 3 + 5 + 7

= 2 + 7

= 9

b ) - [ - 17 + ( - 23 - 4 ) + 11 ] - ( - 9 + 2 ) =

= - [ - 17 + ( - 27 ) + 11 ] - ( - 7 )

= - [ - 17 - 27 + 11 ] + 7

= - [ - 44 + 11 ] + 7

= - ( - 33 ) + 7

= 33 + 7

= 40