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
    100/6.4=
    331776√3
    576*576
    576^(2/3)
    576^2/3
    1.550497-0.029*1.442421*6.102239+0.123368*1.442421*0.891287-0.00210526*6.102239*0.891287-0.086*1.442421^2+0.005*6.102239^2-0.435333*0.891287^2
    0.657189+0.315105*1.442421-0.0173158*6.102239+0.610868*0.891287
    11*10*28+28
    1.286375+0.123368×1.449685×0.890097-0.086×1.4496852+0.005×6.0540882-0.435333×0.8900972
    0.665478+0.315105×1.449685-0.0185×6.054088+0.596132×0.890097-0.029×1.449685×6.054088
    sin6/（1-cos2）

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