4000*2.26/(6*26*22)
    4000*2.26/(6*26*45)
    4000*2.26/6/26
    4*2.26/6/26
    110*(2.21/95.52)^(1/3)*1.05
    31.34*1.05
    25*3/5
    25*3/5
    25÷3/5
    2-e+ln(e+(-1))
    2-e+ln(e-1)
    2-e+ln(e)
    2-e+ln(e-1)
    2+3
    arctan(tan10/tan20÷tan40)
    arctan(tan10/tan20×tan40)
    arctan(1/2)
    arctan(1/2)
    110*(2.28/384)^(1/3)*1.07
    110*(2.28/384)^(1/3)*1.05

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