(1.066349/1.86)^2
    2*(1/1.86-1/3.86)
    ln0.25
    1.05*1.05
    (40*30/15)*0.5+[40+((30-18.76)/18.76-0.85)*180+((30-18.76)/18.76-0.6)*120]*0.5
    (40*30/15)*0.5+[40+((30-18.76)/18.76-0.8)*180+((30-18.76)/18.76-0.5)*120]*0.5
    (40*30/15)*0.5+[40+((30-18.76)/18.76-0.85)*180+((30-18.76)/18.76-0.6)*120]*0.5 >= 80
    （3X+9）：（5X+9）=2:3
    cot30
    COT 30
    (40*30/15)*0.5+[40+((30-18.76)/18.76-80%)*100*3*60%+((30-18.76)/18.76-50%)*100*3*40%]*0.5
    25.48/15 (40+30/15)*0.5+[40+((30-18.76)/18.76-80%)*100*3*60%+((30-18.76)/18.76-50%)*100*3*40%]*0.5
    [40+((25.48-18.76)/18.76-76.6%)*100*3*60%+((25.48-18.76)/18.76-48.9%)*100*3*40%]
    [40+((25.48-18.76)/18.76-80%)*100*3*60%+((25.48-18.76)/18.76-50%)*100*3*40%]
    tanx＝1
    3x＝1
    (1+0.005)^600-1^180+2282/200
    (1+0.005)^600
    (625+59)*(1+0.1)^-1+30*(1+0.1)^-2+(625+30)*(1+0.1)^-3
    （625+59）*（1+1090）^-1+30*（1+1090）^-2+（625+30）*（1+1090）^-3

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