sqrt(x^2+3x)>sqrt(2)
    8╱5(1╱2－1╱5n＋2)＜2024╱1013
    1╱2－1╱5n＋2＜1265╱2013
    -200x2+7800x-75600≥0
    2x<4x+6
    (x-5)(6x+7)>(3x-2)(2x+1)+2
    108+18z ≥900-60z+z^2
    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

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