x≤2x+1
    3x+3＜2x+1
    100×1.2^x-640≥85x
    (x+1)^2-(x-3)^3+(x-π)^4>0
    (x+1)^2>0
    (x+1)^3>0
    ln1-ln2+ln3-ln4+ln5-ln6+ln7-ln8+ln9-lnx>0.1
    sin(tanx)<1
    sin(cos(tanx))<1
    sin(cos(tanx))>1
    abs(x+3)+abs(x-5)<2
    abs(x+3)+abs(x-5)>2
    ex>0
    ln(ex)>0
    3x-1 >5
    8a^3-12a^2+2＞-2
    （4m）^2+16m＜0
    !(x)＞5
    24/31<80/x<7/9
    3m＜0

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