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
    sqrt(3x-4)-sqrt(x-3)>0
    -4+x>5
    4-x>5
    (x-1)(x+2)^2>=0
    x^4+8x^2-9<0
    -3x^2+2x+1<=0
    -3^x+2x+1<=0

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