-3(x-1)≥1-x
    3-2x≥-1
    3x-2>-5
    0.5x+3-4≥x
    x+6/2-4≥x
    （x＋2）/2≥（x＋3）/3
    3x<2(x-1)+3
    （3x＋1）/2-（2x-1）/3>-1
    3-X≥2-2（X-3）
    2/3x＋5>1-x x-1≤3/4x-1/8
    260000(1-m)+120000(1-0.5m)≥233000
    x(80-2x)(100-2x)>=50000
    (r-1)^2/r/(1+r^(0.5))^2≥0.99
    (r-1)^2/r/(1+r^(0.5))^2≥1.01
    （2/x-3）＋1>（3/2）
    (r-1)^2/r/(1+r^(0.5))^2/r≥1.01
    （2/x-3）＋1>3/2
    r*(1+r^0.5)^2/(r-1)^2≥0.99
    0.01*r^2-3.02*r-2*r^(3/2)+1.01≥0
    2.5x≤4x-3<2.5x-3+1

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