(x+7)/(xx-2x+3)<1
    abs(x+2)+abs(x-1)<5
    √(〖(17188-20000×300t/20099.75)〗^2+〖(1751.796-3t-2000×300t/20099.75)〗^2 )≤10
    320k²-507k+324＞0
    (x-3)/2+2>=x 1-3(x-1)<8-x
    5x-2<3(x+1) (2x-2)/3>=x-1
    -3*x^2+5*x-4>0
    x（x+1）^2＜2/e-2
    －a<3a
    3x^2-5x≥0
    134.84*e^（-1203/x）>9
    27000+1140(x+200/x)≤70000
    xx+21500x/57+200<=0
    xx+200<=21500x/57
    10a+25(15-a)≤220
    11a+25(15-a)<220
    -1050+I-（1000-180-600+I）×8%/4-66≥500
    -1050+I-（1000-180-600+I）×8%/4-66≥500
    lnx+1
    1600*1.2x*（2.2/（2.8/1.4x））＞1600*1.2x*（2.2/（2.8/1.4x ））x<5

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