(1-2x)(x-1)(x+2)<0
    3x^2－5x+1≥0
    2x^2－2x+1<0
    －5x^2+7x+6<0
    x2>5
    abs（2x-2）+abs（x-6）≤10
    1/2x-1≤7+3/2x
    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

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