{1/m+[1/(m^2)-2/m+6]^(1/2)}^2-8>0
    1/m+[1/(m^2)-2/m+6]^(1/2)>0
    2^x/ln7-x≥1
    2^x/ln7-x<0
    xx+3x≥0
    x²+2x+4＞0
    x²+2x+1＞0
    m-2≦2m
    e^(x/e)-x≥0
    e^(x/e)-x<0
    e^x/e-x<0
    e^x-x+1÷(e^x-x)≥2
    e^x-x+1÷(e^x-x)<2
    2^abs(x)/abs(x)
    2^h÷h
    x^4-x^2≥0
    39-3x.2x>90
    x²+3x-4≤0
    x^2－x^3＜1
    1/16*x^3+1/4*x^2+x>-2

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