2^(-0.1)
    C(21,10)
    （28504.63+29311.84+38663.06)/3
    （29528+32197+32952+32505.66)/4
    C(42,9)
    C(42,8)
    C(42,7)
    C(42,4)
    C(42,6)
    C(7,1)
    C(49,7)
    C(42,20)
    C(42,5)
    2000*121%+500*242% 2000*121%+500*242%+500*120% 2000*121%+500*242%+500*240% (500*120%)/(2000*100%)
    2000*121%+500*242% 2000*121%+500*242%+500*120% 2000*121%+500*242%+500*240%
    2%×4000/12000+4%×（1-35%）×8000/12000
    3*20
    3-ln(3e)-2ln(3e/4)
    3-ln(3e)+ln(4/(3e))
    1/3*0.04

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