（2m+1)*(2m+1)-4(m*m-2)>=0
    99>98
    9>9
    9>8
    32x＾2＋340x＋1300≤0
    2+x/3≥1-(x-2)/2
    x-3＜2(x-1)
    （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

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