57.70×0.2
    67.416×(20.6)/2
    1/10×57.70×〖0.2〗^2
    [1.2×(39+0.135+0.27+0.267)+1.4×(3.0+2.0+2.0)]
    -41800+2.7×1423×log（1423）-11.9×1423
    (0.667×39×200^4)/(100×1.124×10^9 )
    -41800+2.7×1423×log（1423）-11.9×1423
    1/10×57.07×〖0.2〗^2
    [1.2×(39+0.135+0.45+0.333)+1.4×(3.0+2.0+2.0)]
    2-√3
    √2×300×2244.2/(2*380.1*210)
    √2×500×1855/(2*380.1*210)
    4*78.5*210/(300*200)
    4*78.5*210/(440*200)
    197.78×636.83/(10×(2106.78-636.83) )
    7415.372×10^6/(19000×1973.3)
    2106.78-636.83+503.35
    140578606590.368225/279286872.335
    1/3×2050×（636.83）^3-1/3×(2050-300)×(636.83-242)^3
    1/2×2050×（636.83）^2-1/2×(2050-300)×(636.83-242)^2

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