arcsin5/8
    [3，(1-0.8)×18]
    2.38*(2.38*0.5+1)*(0.2*2.38+1)/10
    sin-90
    cos-90
    1.36*(1.36+1)(0.5*1.36+1)/10
    17.8×0.46×0.6=
    17.8×0.52×0.6=
    17.8×0.54×0.6=
    17.8×0.55×0.6=
    29.8×0.6×0.6=
    57.8×0.6×0.6=
    57.8×0.58×0.6=
    57.8×0.56×0.6=
    57.8×0.55×0.6=
    57.8×5.5×0.6=
    2*2/3
    32.7×0.7×0.65=
    3934405060655949*426109819973771
    1676321*27961*9091

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