Matematika feladatok
  • thghgh
    #1296
    a a+d a+2d .... a+(n-1)d
    9a=a+(n-1)d
    8a=(n-1)d

    5(3a+3d)=(3a+3(n-2)d)
    5a+5d=a+(n-2)d
    4a+5d=(n-2)d
    4a-5d=d
    4a=6d
    a=1,5d

    8a=12d=(n-1)d
    n=13

    Tehát: 1,5d 2,5d 3,5d 4,5d 5,5d 6,5d 7,5d 8,5d 9,5d 10,5d 11,5d 12,5d 13,5d