50t-5t^2=45
    50t-25t^2=45
    -71339.8/280000
    （66.3-78）*6773+3*6773-0.05*248294
    -1250000+442000/(1.11^2)+509600/(1.11^3)+400400/(1.11^4)+353600/(1.11^5)
    -1250000+442000/(1.11^2)+509600/(1.11^3)+400400/(1.11^4)+353600/(1.11^5)
    [(78-54.6)*4113-4*4113+8%*(474814-153993.73)]/153993.73
    [(78-54.6)*4113-4*4113+8%*153993.73]/153993.73
    [(78-54.6)*4,113-4*4113+8%*153993.73]/153993.73
    [(78-54.6)*4,113-4*4,113+8%*153,993.73]/153,993.73
    sqrt(1.8×10^-5×0.2)
    xe-27.35x=0.0051
    lnx-27.35x = 0.0051
    lnx-27.35x=-0.00502
    lnx+2x=1
    2.61/1.6
    -0.00284ln0.169844 = xe-27.35x
    -0.00284ln0.17068=xe-27.35x
    lnx+3x=4
    ex=1

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