(19.8*1.79+20*1.3+22*4.41)/7.5
    2.85*1.25/1.105+2.85*1.25^2/1.105^2+2.85*1.25^3/1.105^3+5.82/1.105^4+101.31/1.105^4
    (0.5×14.3×500×500)/(1235.38×10^3 )=
    (19.4*1.79+19.2*2.9+19.8*3.4+20*1.3+22*4.41)/13.8
    5+5
    (（19.8*1.3+20*2.5+22*1.8+24*1.2×0.044+15×0.86)/(（19.4*1.7+19.2*3.1+19.8*3+20*2.5+22*1.8+24*1.2）+20)
    (0.044-1)×1/(tan40)
    (892.125×10^3-0.7×1.43×500×565)/(1.25×300×565)
    tan65×e^(πtan40)
    tan65×e^(πtan20)
    tan65×e^(π×tan20)
    tan64×e^(π×tan20)
    (19.8*1.3+20*2.5+22*1.8+24*1.2)/8
    (1963000×466.25-0.572×(1-0.5×0.572)×1.0×14.3×500×465^2)/(360×(465-35))
    (（0.8-0.517）×1963000+0.517×306566)/(（0.8-0.517）×1.0×14.3×500×465+306566)
    (19.4*1.7+19.2*3.1+19.8*3+20*2.5+22*1.8+24*1.2)/14.3
    sqrt6.6875%=
    （-20%-17.5%）^2×25%+（10%-17.5%）^2×25%+（30%-17.5%）^2×25%+（50%-17.5%）^2×25%=
    -300+300*0.05^2/(0.1^2-0.05^2)*(0.1^2/0.5^2-1)
    arctan3.7

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