－1/2×4-(－1)≤-5
    π
    46766*949
    34.48^-0.206
    0.518-0.02315*10.183+0.000425*103.67-3*10^-6*1056
    0.518-0.02315*10.183+0.000425*103.67-3*10^6*1056
    cos90*21.65
    cos60*21.65
    cos30/21.65
    cos30*21.65
    sin60*25
    cos60
    [(1+x)/x]*3.15%=0.6049
    307*91
    17*17
    1/7
    3√27
    π
    1734*2.355^-0.25
    (50-x)^0.75=0.24855*(x-40)

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