arctan(0.0121/2.4)
    10^(-10.46)/(1-10^(-5.23))
     -lg(0.063373)
    1-2/3
     (-1)^2+3(-1)+4
    21*43
    1.6/0.1964
    2%+0.98*(20%-2%)
    e-0.1
    8466.5833×2.6836÷2×38.9167×1%
    8466.5833×（1+1.6836）×2÷38.9167×1%
    8466.5833×（1+1.6836）÷2×34.75×1%
    8421.5833×（1+1.6836）÷2×34.75×1%
    e-4
    e-3
    e-2
    13.2*1.5+9*1
    asin(0.5)
    2×（3×4+2）-3(4+5)
    2022÷2021

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