(1*2+2*3）*（1/1*2+1/2*3）+(2*3+3*4)*(1/2*3+1/3*4)+...+(19*20+20*21)*(1/19*20+1/20*21)
    （1*2+2*3）*（1/1*2+1/2*3）
    9^500+9^510+(1/3)^2021
    C(12,5)
    C(9,5)
    C(7,2)=
    C(7,5)=
    C(7,2)=
    C(16,5)=
    C(9,5) =
    C(10,5)=
    C(9,2)=
    C(10,5)=
    C(11,5)=
    C(11,5)=
    C(11,2)=
    -1/3*log(2,1/3)-2/3*log(2,2/3)
    -3/5*log(2,3/5)-2/5*log(2,2/5)
    -3/4*log(2,3/4)-1/4*log(2,1/4)
    -1/1*log(2,1/1)-0/1*log(2,0/1)

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