1500+500(2)=
    A(6,5)
    3024/24
    9*8*7*6
    C(9,5)
    3/4-1-1
    C(6,4)
    A(6,5)
    A(6,4)
    A(3,2)
    1.03^3
    1.04^10-1.03^10
    6.6716/(0.3025×0.9139^60+1/0.9139^60 +1.1) 3.6773/(0.1958×0.9435^60+1/0.9435^60 +0.8544) 4.5103/(0.3721×0.9512^60+1/0.9512^60 +1.22)
    4.433/(0.1611×0.9165^60+1/0.9165^60 +0.8028)
    sin90
    sin90
    （1+0.0258）^3.51
    （1+0.0258）^3.57
    90/(1.7*1.7)
    90/(1.72*1.72)

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