13.5×0.6×0.55=
    13.5×0.68×0.55=
    150+2×150×tan45
    13.5×0.68×0.55=
    (1.1×38.65×10^3)/(0.445×424.1)+(1.1×0.065×10^6)/4493
    (1.1×38.65)/(0.445×424.1)+(1.1×0.065×10^6)/4493
    (1.1×38.44×10^3)/(0.445×424.1)
    1.05×0.9×1.0+2×0.6×0.5
    1.05×1.05×1.5
    1.3×((0.3+0.2+0.16+3)×0.9×0.6+(24+1.5)×1.8×0.9×0.6)+1.5×((2.5+2.0)×0.9×0.6+0.14)
    =1.3×((0.3+0.2+0.16+3)×0.9×0.6+(24+1.5)×1.8×0.9×0.6)+1.5×((2.5+2.0)×0.9×0.6)
    1.3×((0.3+0.2+0.16+3)×0.9×0.6+(24+1.5)×1.8×0.9×0.6)+1.5×((2.5+2.0)×0.9×0.6+0.14)
    -lg6/lg（0.8）
    (0.9×0.24×1.5×1.5)/10
    (6×31)/((31+1)×(31+2))×14.9/18.5
    18.5/0.6
    1/2×10×10×0.22+10×0.39
    0.9×1.2×0.36
    ln6
    1+2

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