(19.9×0.2+18.9×3.6)/58.0
    (18.9×3.43)/53.8
    50（20-10）
    (19.9×1.2+18.9×2.3)/45.0
    (18.9×3.8+18.9×0.7)/65.0
    (18.9×3.43+18.9×0.7)/60.8
    0.892/0.375
    4.2/11.2
    7.7+4.5
    9.7+3.5
    (2.7-1)/(1+0.905)
    0.888/0.387
    5.5/14.2
    0.888/0.402
    5.57/13.83
    5.5/14.2
    (2.65-1)/(1+0.859)
    (2.65-1)/(1+0.859)
    arccos0.25=
    (2×5.57×10-9.9)/(2×9.9)

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