x^2+5x>0
    X^10000000000+x^10000+1000>0
    X^4+X^3+X2^1+1>0
    X^2+2X+5>0
    X+5>0
    ex+sinx+cosx>2
    ex+sinx+cosx>2
    ((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

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