1/2x<-x
    1/(x+3)
    16a^2+16a+20≥0
    (2x+1)/(7-x)<1
    3k×k-7k+2＞0
    6k×k-5k+1＞0
    3k2-7k+2＞0
    6k2-5k+1＞0
    2x^2-90x+242<0
    10x
    65416841*x<57418751
    2x^2-9x+242<0
    3x-2<=-2*sqrt(1-x)
    3x+2<=-2*sqrt(1-x)
    （absx-3）(x^2+absx-2)≤0
    5a+[4(1000-10a)/5]>600
    x^2-x^1/2<0
    x^2+12x-3<3x+7
    x^2-12x+32<0
    14x-40-x^2<0

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