（X-30）【600-（x-50)20】≥8000
    （X-30）【600-（x-50)20】≥8000
    ln√x<1
    1289793.43≤(2164463.05+1289793.43)*0.2
    -4114150+3000000-450000＋X－X×10%/4≥300000
    100+0.9×（a-100）≤2000
    5x＋3＋20＋7≤150
    x^6-21x^5+175x^4-735x^3+1624x^2-1764x+720>0
    20%＜（30*15%+50x）/80＜35%
    20%＜30*15%+50x/80＜35%
    20%＜30*15%+50x/30+50＜35%
    a^2+a≥0
    80(20-x)+70(30+0.5x)<=4000
    2a+3(800-a)>=2100
    9a+13(800-a)<=7700
    9a+13(800-a)<=7700
    2a+3(800-a)>=2100
    5x＜20
    -2x^2+260x-8000≤400
    -2x^2+260x-8000≤4000000

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