((1+x)^7-1)/(x*(1+x)^7)>0
    （1+x）^2>3
    x^2-4x+4>0
    x^2-4x-4>0
    4x-x^2-4<0
    x^2+2x+1≤0
    x+x^2+2<0
    x^2-x+2>0
    x-x^2+2<0
    x^2-110+2800≥0
    3x>x-6
    3x>9x-6
    3x>999635481x-6
    -3x>999635481x-6
    -3x>98x-6
    3x>9
    4-x^2<0
    (2x+1)(x-3)<0
    -8.4/(1+x)+2.44*(1/(1+x)^2+1/(1+x)^3+1/(1+x)^4+1/(1+x)^5)≥0
    2x+3≥2

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