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
    110*(2.28/384)^(1/3)
    arctan(1/3)
    1-1
    2222000/1.05=
    200000*1.1=
    200000*1.1%
     2222000/1.05%=
    2200000*(1+1%)=
    2200000*（1+1%）=
    2060000*（1+1%）=
    2060000/（1+1%）=
    2200000/（1+1%）=

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