2>(1+2*T)/(2*T-2)
    -5x2-5x+24＞0
    lg0.9^t
    lg0.9^t<2
    (18*x-36)/(x^4+4*x^3+6*x^2+4*x+1)>0
     -(9*x-9)/(x^3+3*x^2+3*x+1)>0
    1
    0<3－x<7
    (x-1)／(x+1)＜0
    sqrt(9)*x<3
    sqrt(x)<4
    0.0054*x^2+0.06*x<5.03
    0.0054*x^2+0.06*x*sqrt(3.27*x^2)<5.03
    abs((3x-1)/4)>=abs((6x+1)/5)
    （x^2-1）(x^2-6x+8)≥0
    x-1＜0
    4x-5/x^2-4<0
    200-a>6a a>30
    200-a>6a
    x（x+1）＞0

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