(3.39-1.132)*24.1*10^3/800
    (3.39-1.132)*24.1*10^3/(800-326.6)
    (2.5*0.00465)/(1+50*0.00465)*200*600
    3720/(1000*800)
    3720/(1000*(800-90))
    (3.39-1.246)*24.1*10^3/800
    (3.39-1.246)*24.1*10^3/326.6
    (3.39-1.246)*24.1*10^9/(800-326.6)
    24.2*(2.33+7-1.4)+346.26*(9.33-5.9)-11.85*6.33-119.22*4.33-239.65*0.49
    (3.394-2.451)*(2.47*10^9)/216.2
    (22*0.13+20*(0.215723-0.13))*3+20*2*1.732
    1.3124269-0.050605067*0.077386^0.5*ln0.077386+0.093541279*0.077386/ln0.077386
    e(2)
    -0.050605067*(ln0.07)^3+2*(-0.050605067)*(ln0.07)^2+sqrt(0.07)*(2*0.093541279*ln0.07-2*0.093541279)
    7×(14/11)+(7/3)×(14/11)
    66*12
    (-1.2*6^2+10.1*6+40)/(10.1-2.4*6)/6
    (-1.2*6^2+10.1*6+40)*(10.1-2.4*6)/6
    arccos-0.052950
    arccos-0.074

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