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
    （2x-1）/（x+1）＜1
    （x-1）/（x+2）＜0
    e(x-1)-1>lnx
    abs(2x-3)≤x+1
    k＾2+k>-1/4
    abs(x-2)-abs(4-2x)≤-1
    abs(1-2x)≤7

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