-xx≥0
    xx≥0
    -xx＞0
    -x^2＞1
    2x＞3
    3x-7≥x-8
    1/3x-2≤1/4x+1
    x-7≥3x+2
    1-0.5x≤3
    (2/3)x+2≤1
    3x<5x-4
    1-(x+1)/3>x-x/2-(x+8)/6
    3(1-x)>1-2x 1-(2x-1)/3>=(5x+1)/-2
    (2+x)/3>(2x-1)/5
    4(1+x)/3-1<=(5+x)/2 x-5<=3/2(3x-2)
    2(x+2)>=4/3(2x+3)
    -2-(8-x)/6
    2^2x-2大于1
    -abs(23-x)<-25
    0＜1-x/1+x＜1

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