Răspunsuri

2014-06-20T10:49:48+03:00
A,a+1,a+2,a+3,.......a+86

86:2=43

a+43=200
a=200-43
a=157 -primul numar

a+86=157+86=243-ultimul numar

S=(157+243)*86/2=  400* 43= 17 200-suma tuturor numerelor din sir
6 4 6