log (25,X)>2
    log (25,X)>5
    sqrt (X)>1
    sqrt (X)<3
    3X>15
    x＜56
    x^2-2x-3<5
    x+3/2x-1>0
    x/1-x>=0
    3x^2-7x-10≤0
    168-X-X*10%/4*3≥30
    x(X-1)(X+1）>0
    26700+X-0.025X>50000
    2x+1/x-3≤1
    -3<2X-1<3
    x^2-2x+1≤0
    sqrt（（x^2-3x+1）（-x^2+3x））>-3x^2+9x-2
    1/(x^2+1)-1<0
    x^2-3x+6>4
    cos2x＞1/2

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