570=0.3b+b
    2x－140＝2628900
    3C^(2)＋4C＋45＝0
    4C^(2)＋4C＋45＝0
    (1234567^12345678901234567890)%999999997=
    2cos15-1
    2000*(1+0.0005)^750
    300=5+a
    (e-4)-(e-3)+1
    (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

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