108+18z≥900-60z+z^2
    1-4a≥0
    1-4a>0
    [2(c-3)]^2-4(c-3)*(-1)<0
    1/x-2<0
    x^2+x-4>0
    x^2+11x+28>0
    6.84＜20.84/n＜7.56
    a*(1000-20*(a-25))<700
    -2x^2+4x-3<0
    x^2-2x+3 >0
    x^2-2x+3 <0
    x^2-9<0
    (2m+6)^2-4m(m-2) > 0
    x2-9<0
    x2-2x+3>0
    (2m+2)^2-4m(m-1) < 0
    x2-2x+3<0
    (2m+2)^2-4m(m-1) > 0
    21m×m-6m+5>0

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