136.91×0.87-2×10.5×√0.87
    18.10×0.87-2×10.5×√0.87
    18.1×0.854-2×9×√0.854
    0-2×9×√0.854
    9.8×25.45
    9.8×(3.01+2.4)
    9.8×3.01
    18.096+6.24×(24.45-2.4-3.01)
    0+7.54*2.4
    46497.35^1/3
    5.6*46497.35^1/3[1+(3175/46497.35)^2]^1/6
    3969*(1+0.05%)^401
    5.6 * 17934.7^1/3/[1+（3175/17934.7）^2]
    5.6 * 17934.7^1/3/[1+（3175/17934.7）^2]^1/6
    2π*0.15²+ 2π*0.15*0.72
    7.54×(2.4)×0.854-2×9×√0.854-2×10.5×√0.87
    2×10.5×√1.57
    7.54×(2.4)×0.854-2×9×√0.854+-2×10.5×√0.87
    2*sqrt(3)/3+sqrt(21)/3
    sqrt((7+2*sqrt(7))/(7-2*sqrt(7)))

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