arctan-4
    (50.53+86.33)×6.8
    arctan-4
    (53.58+64.36)×1.2*0.5
    8.33×(1.5-0.857)*0.5
    (29.724+51.03)*0.5
    8.33×(1.5-0.857)
    1/2×[8.33×(1.5-0.857)+(29.724+51.03)×1.8+(53.58+64.36)×1.2+(50.53+86.33)×6.8]
    (20+18.5×1.5+19.8×3.8+19.4×1.8+18.8×1.2+18.8×6.8)×0.28-2×0×√0.28
    (20+18.5×1.5+19.8×3.8+19.4×1.8+18.8×1.2)×0.28-2×0×√0.28
    (20+18.5×1.5+19.8×3.8+19.4×1.8+18.8×1.2)×0.49-2×17×√0.49
    (20+18.5×1.5+19.8×3.8+19.4×1.8)×0.49-2×17×√0.49
     (20+18.5×1.5+19.8×3.8+19.4×1.8)×0.61-2×29×√0.61
     (20+18.5×1.5+19.8×3.8)×0.61-2×29×√0.61
    （20+18.5×1.5+19.8×3.8）×0.66-2×55×√0.66
    （20+18.5×1.5）×0.66-2×55×√0.66
    (20+18.5×1.5) ×0.70-2×15×√0.70
    1/672.746×1/3 [1.27×(4+1.3-0.857)+83.43×2+60.21×1+527.835×7.5]
    (50.638+90.118)×7.5*0.5
    (50.638+90.118)×7.5

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