ln3
    log(2，1)
    0.16*55
    √2000
    100*(0.8-0.2^2)^2+(0.2-1)^2
    100*(-2-5.4^2)^2+(5.4-1)^2
    1372×1.0513×（1+0.0155）×1.1870×0.9926×1.0000+0
    1145×1.1291×（1+0.0407）×1.0975×0.9992×1.0000+0
    1372×1.0488×（1+0.0155）×1.1870×0.9926×1.0000+0
    7000-60-421.33
    ln e5
    1+1
    √3+√3
    15/sin36
    17*17
    7*17*17
    √2×6
    1-[62.1*(1-6%)]/90
    1-[60.3*(1-6%)]/90
    1-[57.6*(1-6%)]/90

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