1+m<0 3m+6>0
    1+m<0
    mx^2-mx-1<0
    6x^2+5x+1<0
    X=20730-X*0.03
    X=20740-X*0.03
    X=20748-X*0.03
    X=20748-X*0.01
    X=20748-X*0.015
    0.25 * 0.75 ^x / (1 - 0.75 ^(x + 1)) <= 10^(-6)
    （x+1)(x+2)-(x-3)(x+6)
    －8k≥0
    1+x^(2)大于或等于0
    1+x2大于或等于0
    6-2x≤x^2-3x<18
    6-2x≤x^2<18
    x(x+2)>0 x^2<1
    x^2-4<0
    6x^(2)<2lnx
    6x-2lnx/x>0

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