5x-2≤3（x+1）
    -12500+x-(50000+x)*1%≥5000
    a^3-8a^2-8<0
    3x+1>5(x-1)
    2x^2-x<0
    （3x+4）+(3x+4)/(x+1)≥
    （x-1）（3-x）＞0
    x-1140-X*0.08/4≥500
    5＾n＞10＾7＋1
    abs(x-3)
    26z+68(20-z)<= 1000
    n^2+2*n>300
    (950x+400)*2.703<(1083x+400)*2.29
    (950x+330)*2.703<(1083x+330)*2.29
    (950x+330)*2.68<(1083x+330)*2.58
    (884x+330)*2.88<(1083x+330)*2.28
    (1016x+330)*2.48<(1083x+330)*2.28
    (950x+330)*2.98<(1083x+330)*2.58
    (950x+330)*2.68<(1083x+330)*2.28
    -41800+30000-4500+x-x*0.1/4≥3000

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