（1+2x）÷3>x-1
    (x-2)(x-3)>-2/9
    (x-1)(x-2)>-4/9
    26700+X-X*2.5%=50000
    X/2X-1>1
    {6/2x-5≥4/3x+1-2/3x 4（2x-1）>3(4x+2)
    6/2x-5≥4/3x+1-2/3x 4（2x-1）>3(4x+2)
    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

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