-2/3×ln√2/2
    -3/2×ln√2/2
    √（20+4√10）
    6290*6.14
    arctan0.5=
    tan(0.5)=
    e∧ln0
    -4000+820*{(1+0.15)^10-1}/{0.15*(1+0.15)^10} =
    -4000+820*{(1+0.15)^10-1}/0.15*(1+0.15)^10 =
    370*600
    1:0.25
    4.2:0.25
    (397.19+478.80+((397.19+478.80)*3.9/2)*3.9*1/3)
    (397.19+478.80+（（397.19 +478.80）/2)*3.9*1/3
    (397.19+478.80+√397.19*√478.80)*3.9*1/3
    (397.19+478.80+√397.19 *√478.80)*3.9*1/3
    (397.19+478.80+√397.19 *478.80)*3.9*1/3
    √397.19*478.80
    27600*1.25
    -2^2-6/(-2)*3

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