Question

14. Calculati suma elementelor multimii C= {x € Z | x € A reunit cu B} in urmatoarele cazuri:
A= [ - radical din 2 ; 7) si B= [ - radical din 5 ; 3]

Answer 1

a) A u B = {-1,0,1,2,3,4,5,6} u {-2,-1,0,1,2,3} = {-2,-1,0,1,2,3,4,4,5,6} care este C

suma -2-1+0+1+2+3+4+5+6 = 18

b) A u B = {-4,-3,-2,-1,0,1,2} u {-5,-4,-3,-2,-1,0,1} = {-5,-4,-3,-2,-1,0,1,2} care este C

suma -5-4-3-2-1+0+1+2 = -12