1/(x−9)+1/(x+ 2)≥2x/(x^2+x−2)
    6x^2+2x-2>
    （21/2）a∧2-（9/2）a∧3＞0
    3x+(20-x)(-1)>=10
    (x^2-2)/(x+4)≥-3x+10
    3x-5<(11x-17)/(x+3)
    2x-4>(7x-11)/(x+2)
    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)

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