x²≥2
    3c-6>c
    -2X+1>0
    1200000+450x≤1000000+500x
    4－4m＞0
    3000+A<=4000+A/2
    3000+A<=4000+2/A
    3000+A<=4000+A/2
    10-2X≤5(6-2X)
    X/4-1+10X/7+40X/6<=112
    x/4-1+x+7x<=112
    x/4-1+2x+6x<=112
    3x+2x^2>x^3
    3x+x^3>2x^2
    x^3+2x^2>3x
    ((5*z)/4)*(80/(80-z))^60>7
     ( x / 4 ) - 1 + 2 * x + 2 * ( 14 * x / 6 )<=112
    [x/4]-1+2x+2[14x/6]<=
    [x/4]-3+6*[12x/14]+[12x/5]<=112
    [x/4]-2+4x+[14x/6]<=112

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