arcsin（1/2）
    sin15
    7.5/1000*24*6/7
    1/1.025
    240÷8
    240÷6
    2 × (3 × 4.5 + 3 × 4.5) + 3 × 3
    2 × (10 × 4 + 10 × 6 + 6 × 4)
    2 × (14 × 8 + 14 × 30 + 8 × 30)
    2 × (14 × 5 + 14 × 6 + 6 × 5)
    2 × 2 × (25×20 + 25×10 + 20×10)
    2 × (30×25 + 25×20 + 30×20)
    81391.9*40000/(126584759.83+40000)*4.69-40000*0.003
    800000*40000/(126584759+40000)*4.69-40000*0.003
    81391.9 * 9765 / ( 126584759.83 + 9765 ) * 4.69 - 9765 * 0.003
    (81391.9+17.271) * 9765 / ( 126584759.83 + 9765 ) * 4.69 - 9765 * 0.003
    3/(cos(3π/4))^2
    1/(cos(3π/4))^2
    1/（cos(3π/4)）^2
    5*10/(5+10)*5-10*0.002

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