1/(x-2)<=(1+x)/(2-x)+3
    (4x-4)/(x-2)>0
    (4x-4)/(2-x)>0
    0-a^2-a√（a^2+8)＞4
    x^2-3/2x+1/2<0
    4x^2-36x+45<0
    x2+4x-12<1
    x2+4x-12>0.5
    （3x-3）（x+1）＞0
    sqrt(x^2-1)>3
    sqrt(x^2-x)<2
    0
    （20+x）*x<100
    -6(x-90)^2+5400>5250
    -10x^2+800≥8000
    -10x^2+800=≥8000
    -10x*2+800x≥8000
    -10x^2+800x≥8000
    -x^2+x-3<0
    x^2-2x+1<0

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