log(2,1024)+C(8,5)
    74*(1+9.2%/12*6)*(1+0.3%)
    74*(1+9.2%/12*3)*(1+0.3%)
    100（1+12%/12*3）*（1+0.3%）
    1÷3÷4
    2÷5/4*4/5
    5/8*16
     sqrt(1:2)*63.0105*4.4555-(1:2)*10*4.4555*4.4555
     sqrt(1:2)*45.365*3.208-(1:2)*10*3.208*3.208
    6÷6/7
    sqrt(1:2)*45.365*4.4555039-(1:2)*10*4.4555039*4.555039
    63.01036:sqrt(2)
    sqrt(1/2)*45.365*3.207789-(1/2)*10*3.207789*3.207789
    45.365:sqrt(2):10
    sqrt(3970.305399)
    sqrt(2057.977)
    (-298400-20*sqrt(22401400))/(-99)
    (-298400+20*sqrt(22401400))/(-99)
    0.747×4/3
    23-18

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