2/3*25.3*(450*sin(3.14*0.454))^3+335*400*6842*(sin(3.14*0.342)+sin(3.14*0.454))/3.14
    2/3*25.3*(450*sin(3.14*0.454)^3+335*400*6842*(sin(3.14*0.342)+sin(3.14*0.454))/3.14)
    2/3*25.3*(450*sin(3.14*0.454)^3+335*400*6842*(sin(3.14*0.342)+sin(3.14*0.454))/3.14
    2/3*25.3*(450*sin(3.14*0.454)^3+335*400*6842*(sin(3.14*0.342)+sin(3.14*0.454)/3.14
    （500*750+1800*1000)/(500+1800)=
    (9.64/4.82)*169.3*lg(169.3/0.15)
    2/(e(2*3.1415926*1.715/4.614)+e(-2*3.1415926*1.715/4.614))
    (e(2*3.1415926*1.715/4.614)+e(-2*3.1415926*1.715/4.614))/(e(2*3.1415926*1.715/4.614)-e(-2*3.1415926*1.715/4.614))
    e(2*3.1415926*1.715/4.614)
    e(2*3.1415926/1.7154.614)
    3×5/3-2
    3 5/3-2
    417.330939-273.15
    423.317852-273.15=
    0.42×1.43×400×860+1.25×300×2×50.265*860/200
    5×10649.4476×10^-6
    0.42×1.43×400×860+1.25×300×2×50.265*860/560
    0.42×1.43×400×860+1.25×300×2×50.265/560
    0.85*0.88*0.8
    1×14.3×3000×120×(860-120 /2)

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