x＾2-0.56x-0.1025<0
    x＾2-0.56x-0.0975>0
    7000<=80a+50(100-a)<=7200
    12/(x+2)>-1.5x+6
    168-x-x×10%/4×3≥30
    -12000+x-x*8%/4≥3000
    4000*12+6000*12*（x+2） <7000*12*x
    4000*12+6000*（x+2）＜7000*x
    x^2 +3x-2<0
    6000*12*（t+3）＜7000*12*t
    5000*12*（t+3）＜7000*12*t
    x-5/2>=x/4
    2x^2-5x-3<0
    2x2-5x-3<0
    -2/3x+2>=5
    x>5
    0.2x+180/(x+5)≤11.2
    tanx>x^2
    4/9a*2＋27a*4/8－10/3＞0
    729x*2－720x＋96＞0

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