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
    -x^2-2x+3≥0
    x^2-7x+12＞0
    10x十14（100一x）≥1160 10x十14（100一x）≤1168
    -15000+X-X×8%/4≥4500
    8x/(x^2+4)>x
    x+7/x+2≥0
    x+7/x+2≥2

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