((x-1)lnx/(x+1)^2)-((lnx+1)/(x+1))+1/(x(x+1))>0
    2加3（x加1)/8>3-（x-1）/4 2x减1小于（2x加8）/3
    2加3（x加1)/8>3-（x-1）/4
    60.7X+17>76x+16
    47x+25>55x+23
    47x+25<55x+23
    28.7x+22<58x+18
    6250000a^2-7475a-99>=0
    50^4×a^2-2.99×50×50×a-99>=0
    20lgx>=20
    6250000a^2-4247775a-10000>=0
    6250000a^2-2504975a-10000>=0
    x^2-3x-10≤0
    (x+2)/(x^2-5x-6)≥0
    -a/2≤a
    9.92x^3-98.25x^2+216.15x-81.48≥0
    9.92x^3-98.25x^2+216.15x-40.74≥0
    9.9x^3-98.31x^2+216.81x-40.77≥0
    9.9X^3+3≥0
    9.9x+3≥0

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