3x-1<2(x+1)
    1-3（x-1)<8-x
    3-2-5x<3x
    x-3x+3<7
    x-3x+1<7
    (x^2+8/x^2+9)/(1+x^2)＞0
    x*2^(-x/2)＞1
    x2^-x/2＞1
    2（2x-1）-3(3x-2)≤6
    (x+5)/2-1<=(3x+2)/2 (y+1)/3-(y-1)/2>=(y-1)/6 2(3x-1)-3(4x+5)>x-4(x-7) 3(x-2(x-1))<=4x
    -7≤2x-1≤7
    x^2-x-6≥0
    （x-7)^2<=1/4
    （x-7)^2>0
    ((2000-50*x)/2.5*x^(1/2))>=1.645
    x-1<0 x+2>=0
    x-1<0
    x/(1000-x) > 0.3
    100－y≥2/3y
    3x+8-5(x-1)＜5

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