x<8lgx
    -4^2+18x-81/4>=0
    x^2-4x-5<=0
    -x^2+8x-3>0
    2x^2+7x+3>0
    0.01>e-x+x*e-x>0
    0.01>e-x+x*e-x
    105x^3＋5x^2＋5x－90 = 0
    3860+500+2(500(1+x)+500(1+x)(1+x))>=7000
    (3x-1)/(2-x)>=1
    x(x+2)/(x-3)<0
    （-5/2）<(-x/2)+1<(-3/2)
    abs((x/2)-1)<=1
    64564+546576
    abs(x+6)-abs(x-3)>2
    abs(x)>2
    abs(2)>2
    (5/2+5y)^2
    x^2-1<=-x-1
    x^2-1<=x+1

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