-2x<=2
    3x+1<2(x+2)
    3a-1+3/(a-1)-2ln((a-1)/3)>=0
    e((-a-2+sqrt(a^2+8))/2)*(1-a*((-a-2+sqrt(a^2+8))/2)-((-a-2+sqrt(a^2+8))/2)^2)<=1
    sinx＝0.3 x＜90
    sinx＝0.3 0＜x＜90
    log（3，x）>-3/2x-3/2
    cosx≥-sqrt(3)/2
    1<=sqrt(x^2+(2*x-3)^2)<=3
    1<=sqrt(x^2+4*x+9-12*x)<=3
    1<=x^2+4*x+9-12*x<=9
    abs(x)<1
    abs(2x+3)>1
    x^2-x-30<0
    (x^2+6)/2>11/5
    7x-3<=9
    6x^2-3x+7<0
    10*x+5*(800-x)≥4800
    10x+5*(20-x)>90
    abs(x-3)<=1

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