（x+1）/6-(2x-5)/4≤1
    2≤-3x
    -3≤x*2/3
    80+0.95*(x-80)≥120+0.9*(x-120)
    80+0.95*(80-x)≥120+0.9*(120-x)
    log(a,1/2)>3/4
    -42x^-16x≤320
    -x^2-2<=3x<=x^2+2
    x+5>=5/2
    x^2+3x+2>=0
    0.2≤0.2x-4＜0.4
    2≤4-0.5x＜4
    2≤4-2x＜4
    2≤2x-4＜4
    4√x+2x+1<0
    4x^2+2x+1<0
    2m*m+7m>4
    2m2+7m>4
    x+3/x-2<1
    (x-1)^2>(x+1)^2

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