1-a^2<2a
    1-a^2<2a 1+a^2>0
    x^2＞0
    x^3＞0
    0
    1/k+1-0.9^k＜1
    25x+18（100-x）<=2000
    -2x²+x+1<0
    (x+4)(x-3)^2>=0
    x＾2-3x+2/x＾2-2x-3≤0
    x-3/2x>0
    x((60-12x)/25)>72/25
    2x*x-5x-3>0
    2x*x-3x≤0
    （X+2）（X-1）＜0
    （X+2）（X-7）＜0
    （X-3）（X-5）≥0
    1+1/(x-5)>0
    sqrt（4x-x^2）＜x
    1/6*(7x-2)-(3x-1)/2-(1+2x)/3 > 1

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