-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
    m-1
    abs(x^3+3x^2-5x+10)≥100
    x^2-5-1≥0
    x^2-x-1≥0
    x≤4／x≥6
    x≤4x≥6
    x≤4；x≥6
    -12k＜6
    2＾x≤1
    59x+x^2<=2400
    -1＜1╱x＜-1
    x²＜1-lnx
    x^2-3x-10<0

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