(86800-0.3×89400)/(0.9×0.546×360)
    89400/(0.8×0.76×360)
    123500/(0.9×0.546×360)+89400/(0.8×0.76×360)
    1109.612×1000×340-14.3×600×129.325×(565-0.5×129.325)=
    (90600-0.3×60100)/(0.9×0.742×360)
    60000/(0.8×0.85×360)
    0.045*398*398*1.39939153
    109400/(0.9×0.742×360)+60000/(0.8×0.85×360)
    0.045*398*398*(cos29+0.3*cos58)
    109400/(0.9×0.742×300)+60000/(0.8×0.85×300)
    0.045*398*398*(cos29+0.3*cos2*29)
    55+20+600/2-35=
    1+1/195.588×5.5^2×1
    1300×(72.131×1000/1109.612+20)/565
    0.7×1.16×72.131=
    2000×(0.03/1.03)/(1－(1/1.03)^15)
    1300×(72.131×1000/1150.281+20)/565=
    1.05^(140/365)
    0.04^0.5
    0.05^2.5

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