-450+x-690-x*0.08/4≥500
    a^2+a<2
    8-2m＜0
    x^2－8x＋15＞0
    4*m^2-5*m+1>0
    x^2+4x-21>=0
    6x-2>2(x-4) 2/3-(3-x)/2<=-x/3
    1-2x<3 (x+1)/2<=2
    m^4-8m^2+4m+3>0
    (-m^4)+(4*m^2)+4*m-15>0
    (-m^4)+(12*m^2)-15>0
    x<3(200-x)
    18x+22(200-x)<3420
    (1-5x)/2>=(3x+1)/3-1
    5x+6>2(x-3)
    (x-1)/7+1/3<(2*x+5)/3-7/2*x
    -x^2+2x+2<0
    -4+x-X^2<0
    [2*(4*x-3)]/3<[5*(5*x+12)/6
    x^2-6x+9<0

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