2.5+2×38（1-cos30）
    38/2×sin30
    ln10
    ln7
    ln5=
    ln2
    ln3
    ln0.6529/0.6529-0.6529+1/0.6529+2=
    (1-ln0.6529)/0.6529^2-1/0.6529^2-1=
    e^0.5671-ln0.5671=
    247860/1.06
    247860*1.06
    3√3×4√3×4√27
    1274/274
    1274/274
    1027/274
    （（16.4*2.6%）/1+40%）*40%
    (tan(17.65)-17.65)-(tan(20)-20)
    (tan(17.65)-17.65)-(tan(20)-20)
    48/(2*tan(20))

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