2.5n(1+5%)^n-4(1+5%)^n≥0
    x^2-x>0
    x^4-9x^3+26x^2-24x≥500
    x^4-9x^3+26x^2-24x≥1000
    27x∧4-36x^(3)-45x^(2)+38x+16>0
    5x^(2)+2x≤20
    x^(2)-5x+6>0
    0.2
    7/5x=80
    5^x>1000
    x^3-2*x^2-(1/99)*x<200/99
    20x^2-20x+1>0
    x^2-2x+1>=0
    625*（x^2-2000*x+1000000）>= 1700*x
    625*(n-1000)^2>=1700n
    (50x-50000)/(1700x)^(0.5)>=2
    50x-50000>=2*（1700x）^(1/2)
    25x-25000>=(1700x)^(1/2)
    25x-25000>=1700^(1/2)*x
    1≥151800*x^3*（1-x)^97+4950*x^2*(1-x)^98+100*x*(1-x)^99+(1-x)^100≥0.95

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