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)
    -3/4*log(2,3/4)-1/4*log(2,1/4)
    -7/9*log(2,7/9)-2/9*log(2,2/9)
    -4/6*log(2,4/6)-2/6*log(2,2/6)
    -3/6*log(2,3/6)-3/6*log(2,3/6)
    -8/13*log(2,8/13)-5/13*log(2,5/13)
    -8/17*log(2,8/17)-9/17*log(2,9/17)
    2*1000*20000÷4000
    arctan0.4
    2^(-1/2)
    2^(1/2)
    -(1.000001^1000000)+e (1.000001^1000001)-e
    -1.000001^1000000+e 1.000001^1000001-e
    13^13 e(13ln13)
    6^6 e(6ln6) e(xlnx)=x^x
    18023/(1-2.667%-0.95%-4.76%-0.0476%)

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