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
    -15000+x-x*8%/4<=4500
    0.75x+50≥380
    xlnx－（1/2)x^2＜-（1/2）
    x^4-x^3sinx＞0
    -4082750+3000000+W-450000-W*10%/4>=300000
    (1-4y)/y>4
    2/3x+5>1-x x-1<3/4x-1/8

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