（x+1）（x－1）^2（x－4）^3<0
    1+2>3
    -1<2x^2+x-1 2x^2+x-1<0
    2x+11>3x+5
    3x-7>5x-2
    8000*(1+x)*0.995>=8000
    4000*(1+x)*0.995>=4000
    4020*（1+x）*0.005>=20
    4000*（1+x）*0.005>=20
    32((45.17-x)-31.5)>(45.17-x)(32-(18.09+x))
    36((45.17-x)-31.5)>(15.17-x)(36-(3.73+x))
    70((70-x)-30)>(70-x)(70-(20+x))
    x－3/x＋1≤3
    x+1/x^2-4>0
    x^2+2x≤0
    4
    2.5x^2－15x＋22.4<0
    x+2≤5
    (5x+3)/(2x-3)<2
    sqrt(x+1)<2x-1

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