440×18×(170.8-9)+2×10×(542-389.2)×(542-389.2)/2
    √((86.83/253.23)^2+(142.14/408.5)^2 )
    (102.25×10^6×180)/129600
    √((86.83/253.23)^2+(142.17/408.5)^2 )
    (102.36×10^6×180)/129600
    4×32400
    347.3/4
    0.677×(23.06×300^4)/(100×9350×8333330)
    (0.31×10^6)/166667
    0.1×31.57×〖0.3〗^2+0.177×1.61×〖0.3〗^2
    1.0×[1.0×(1.0+0.6+145.6)+1.0×(2.5+4)]×0.15
    1.1×1.3×(1.0+0.6+145.6)×0.15
    (2×7.5×10×0.1×0.1)/(0.25×10)
    0.677×(153.1×150^4)/(100×9896×281250)
    (0.51×10^6)/37500
    0.1×209.64×〖0.15〗^2+0.177×10.73×〖0.15〗^2
    0.677×(153.1×200^4)/(100×9896×281250)
    (0.91×10^6)/37500
    0.1×209.64×〖0.20〗^2+0.177×10.73×〖0.20〗^2
    1.0×[1.0×(1.0+145.6)+1.0×(2.5+4)]×1

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