-1<1-a^2<1
    x+12/x+4>-1
    x+12:x+4>-1
    （2x-1）/（x+1）≥0
     5（x-1）/（2-x）≥0
    5（x-1）/2-x≥0
    100<100(1+x)0.9<103
    X(24-2X)>35
    x^3-6x^2+6x-x≤0
    （40-x）（10＋x）≥600
    13-4x²＞0
    e^((-3.1415926535*x)/sqrt(1-x^2))<0.35
    k^2+2k-7≥0
    -1<-3x^2+10x-7<1
    x(1-x)^2＞0.2
    x(1-x)^2＞0.1
    2X-1＞=02X-1＜=1
    2X-1＞=0＜=1
    2X-1＞=0
    5x-x^2≥0

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