π(426^2-419^2 )/64
    (0+133.1)×2.94+2×13.3×√2.94
    (0+40.92)×2.94+2×13.3×√2.94
    (0+40.92)×1.59+2×11.8×√1.59
    0+2×11.8×√1.59
    (287.58)×0.34-2×13.3×√0.34
    (0+195.42)×0.34-2×13.3×√0.34
    (0+195.42)×0.63-2×11.8×√0.63
    7×1338.5
    0.677×(20.70×725^4)/(100×9350×8333330)
    (12.99×10^3×125000)/(8333330×100)
    0.6×28.21×0.725+0.617×1.61×0.725
    (1.63×10^6)/166667
    0.1×28.21×〖0.725〗^2+0.177×1.61×〖0.725〗^2
    1.1×1.3×(1.0+0.52+130)×0.15
    1.1×1.5×(2.5+4)×0.15
    1.0×[1.0×(1.0+0.52+130)+1.0×(2.5+4)]×0.15
    1.1×1.3×(1.0+0.52+130)×0.2
    (7.5×10×9×0.1×0.1)/(1.3×10)
    15+18.6×9.7+19.2×（18-9.7-0.5）

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