tan-2/3
    tan-2/3
    3.5*32/cos19.528
    249×[(1+4.75%)^2-1]+174.00×[(1+4.75%)^(2/2)-1]
    249×[(1+4.75%^2-1]+174.00×[(1+4.75%)^(2/2)-1]
    249×[(1+4.75%^2-1]+174.00×[(1+4.75%)^2/2-1]
    249×[(1+4.75%)2-1]+174.00×[(1+4.75%)2/2-1]
    136100/(0.985×6013)
    0.45*0.55*2.55
     (31*62)/961
     31*48
    (330000×300)/(2×0.7×10×500^2/6)
    (330000)/(2×0.7×10×500)
    574200/(2×0.7×10×500)
    (660×10^3)/(2×33.333×155)
    (660×10^3)/(2×33.333×（120-2×80/3）)
    (660×10^3)/(2×33.333×82.667)
    log(0.99,0.9)
    log(0.99 0.9)
    1-1

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