x×0.92-x×0.5>57
    -2x≤-4
    x*92％-x*50％≥44.4
    1+x-e^x＜0
    5 ( 3x－2 )＞9x＋2
    1/4x+1≤1/3x+1/5
    1/4x-5/2≤-1/6x
    -3x＋4＜5x＋6
    16x－4(3x－2)≤18＋6 (-3x＋2)
    16x－4(x－2)≤18＋6 (-3x＋2)
    5－5/3x＞7－x
    5－x＞7－x
    x＋7 ≥－2x＋1
    x--5/6>-6/2x+13
    0.2x-0.3≤0.5x+0.7
    5*n^2+n-500＜0
    abs(x^2+2*x+2)<2
    -48+x-x*0.02≥50
    x*x-156x-12800>0
    (x+100)*(1-128/x)>128

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