x≤1-2
    x＜1
    19109*(1.1)n>=40000
    3cosx-√3sinx>√3
    3cosx-√sinx>√3
    -3x^2-2x+1＞0
    4x-1.5（30-x）>100
    x/2-1＞x
    0.2x/0.3-(6-7x)/3≤1
    2^x<10^(-9)
    (3*x+1)/2+x/3>(1+2*x)/2+x/2
    6*x+2>2+4*x
    3*x+1>1+2*x
    2(3*x+1)>3(1+2*x)
    (3*x+1)/3>(1+2*x)/2
    0＜2x+5＜7
    -3x≤9 3x-2<4 2x-1999≤3
    -x/6≥1
    abs(x-1) ≥abs(x+3)
    x-1≥x+3

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