Question

Aflati valoarea expresiei numerice: a)-3-8+12-4+11; b)4-5+11-9-4; c)9-2-8+4-21; d)-16-7+32-21+17; e)-16+9+27-11-8;

Answer 1

a),  =8

b). -3

c).  - 18

d).  5

e). 1

Answer 2

a)  - 3 - 8 + 12 - 4 + 11 = 8

= - 11 + 12 - 4 + 11 =

= ( - 11 + 11 ) + 12 - 4 =

= 8

__________________

b) 4 - 5 + 11 - 9 - 4 = - 1 + 11 - 9 - 4 = 10 - 13 = - 3

_____________________________________

c)   9 - 2 - 8 + 4 - 21 = 7 - 4 - 21 = 3 - 21 = - 18

______________________________________

d)   - 16 - 7 + 32 - 21 + 17 = - 23 + 11 + 17 = - 12 + 17 = 5

________________________________________

e)   - 16 + 9 + 27 - 11 - 8 = - 7 + 27 - 19 = 20 - 19 = 1