（0.3+0.2+24×1.0+1.5×1.0）×0.16
    0.9×(1.3×(0.3+0.2+24×1.0+1.5×1.0)+1.5×(2.5+2))×0.16
    (5×23.22×160^4)/(384×9898×253125)
    (0.104×10^6)/33750
    (32.64×0.16×0.16)/8
    （0.3+24×1.0+1.5×1.0）×0.9
    0.9×(1.3×(0.3+24×1.0+1.5×1.0)+1.5×(2.5+2))×0.9
    (44.07×10^3)/(300×300)
    44.07/0.36
    1.0×((0.3+0.2+0.16+3)×0.9×0.9+(24+1.5)×1.8×0.9×0.9)+1.0×((2.5+2.0)×0.9×0.9+0.28)
    ((0.3+0.2+0.16+3)×0.9×0.9+(24+1.5)×1.8×0.9×0.9)+((2.5+2.0)×0.9×0.9+0.28)
    300+2×150×tan45
    (1.1×57.65×10^3)/(0.475×537.2)+(1.1×0.05×10^6×0.9×1.5)/7293
    (1.1×57.65×10^3)/(0.475×537.2)
    2020/20.18
    1.05×0.9×1.5+2×0.6×0.5
    1.05×1.05×1.5
    1.3×((0.3+0.2+0.16+3)×0.9×0.9+(24+1.5)×1.8×0.9×0.9)+1.5×((2.5+2.0)×0.9×0.9+0.28)
    1.3×((0.3+0.2+0.16+3)×0.9×0.9+(24+1.5)×1.8×0.9×0.9)+1.5×((2.5+2.0)×0.9×0.9)
    (6×19)/((19+1)×(19+2))×17.6/17

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