2×50000÷317.925
    1×50000÷317.925
    3×50000÷317.925
    20×50000÷317.925
    33×50000÷317.925
    12×50000÷317.925
    5×50000÷317.925
    1+1-1+1
    2*3/2*3
    2-3*3-2
    12+68
    45+28 0.87+7.5 45*9 546*8 51-38 68*7 45*12
    0.7*8 56+23 34+56 9*8 562-70 502-34
    21+4
    20lg50000
    lg(1/20)
    lg(2/20)
    lg(2/14)
    lg(10)
    arctansqrt3

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