2小于等于x 3大于等于x
    2小于等于x3大于等于x
    x^2>=1
    x>=√1
    x+1>=0
    x-1>=0
    x^2-1>=0
    7.2x+21.6<12x
    [1/(x-5)]+[1/(x-7)]>[1/(x-9)]+[1/(x-3)]
    (x^2-3*x-28)/(x^2+2*x-3)≤0
    1<(x-1)/(1-2*x)≤2
    4*(x^2)-4*x<0
    -x^2+4*x+5<0
    x^2-2*x-3>0
    x^2-6*x-27<0
    x^2-4*x+1<0
    [(1-2*x)]/(x+1)>0
    1.25^x+0.8^x+0.8^x>=3
    (x十3)/7>x一5
    x十3/7＞x一5

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