5.522453/[-0.1996e^(0.38*5.522453)+5.0431]
    5.522453/[e^(0.38*5.522453)+5.0431]
    5.522453/e^(0.38*5.522453)+5.0431
    5.522453*e^(0.38*5.522453)+5.0431
    3635+（300*4.85）+（300*5.05）+（377*5.15）+200+150+300=
    0+1
    (4/15)/(-(2/5))
    7*-1/7
    7*-7
    -0.25*8
    -1/5*1/5
    15*1/3
    (-7)*(-6)
     (100+380)*(1000-2*380)
    (100+20)(1000-2*20)=
    56+56*(53/2)
    3^4
    0.65*1/10^0.5
    0.65*1/14^0.5
    0.65*1/15^0.5

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