13.5/17.878829
    22.09779362*(1-e^(-0.11867491*20))^2.13993087
    17.97042396*（1-e^（-0.1272268*16）^2.59336072
    220/488.4
    176.4/326.9
    712.695*488.4
    712.695*326.9
    0.441*960+0.3813*750+0.0056*600
    C(17,6)
    C(11,3)
    C(7,1)*C(6,3)*C(3,3)
    C(8,4)
    5/14*(14/25+28)
    4+1
    7/3*9+6+11/3
    600-50+350-100-279-19×4-18-16+400-139-29-18-18-135-55-10-80-29-39-8-13-89+300-6-60-15-15-36
    sqrt(4+64/9)
    sqrt(4+(8/3)^2)
    331*e^(-4/9.286688)
    arcsin0.589

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