2^X+X/2 >2+1/2^X
    2^X+X/2>2+1/X
    x^2-80x+720<0
    3x^2+2x+1/x^2+x+2<1
    3x^2+2x+1/x^2+x+2<=1
    2*x+(1/x)-3<0
    (x-1)/ln(x) ≤ 1.05/2*(1+x)
    2≤2^(k-1)≤1000
    2≤2^k-1≤1000
    (60/x+20)+(40/x-20)<=4
    1-2x<1
    (y＾-5y+6)/(y＾2+3y+2)<3
    x+2╱x²-5x-6≥0
    -X²+2X-3＜0
    ln3*X+1<0.0001*（3^x）*ln3^2
    sin32>sin21
    (16+4m^2+16m)/m^6-(8/m^2+4)*(((4+m^2+4m)/2m^4)-2)>0
    x（7-x）小于78
    abs（x^2-4x+6）＜1
    abs（6-3x）＜2x-1

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