3x^(2)+5x<0
    -2x^(2)+x-5<0
    -x+4x-4<0
    (x+1)/(x-2)-(x+7)/(x+1)>0
    x^(2)-x-9╱x-1<1
    x+1╱2x-3≤1
    x+2╱3-x≥0
    -20x^(2)-9x+20≤0
    a^(2)-7a+6≥0
    x^(2)+x-6>0
    4-3(x+1)/4>=5(x+2)/8+2
    (2m+1)^2-4(m^2-2)>0
    －a^2－3a+10≥0
    －a^2-a+10≥0
    －4a^2＋6a＋4≥0
    （a＋1/2）^2≤41/4
    (a－3/4）^2≤25/16
    5x-2x^2-x>0
    x^2+2*x-5=0
    x^2-2*x+5=0

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