4x-7>5x-5
    3X^3-20X^2+6X-30<0
    log (X,9)>(1/3)
    log (X,9)>2
    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

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