(x+1)/(4-2x)<1
    x+1/4-2x<1
    (-2*x)/(9-x)+(-x+1)/(4-x)>0
    (-2*x+1)/(9-x)+(-x+1)/(4-x)>0
    3x-8/2x-1>x-4/x-1
     (250-x)*0.8<(350-x)*0.5
    -1<6/y
    1+2a>0
    （a-2）>0
    1－2∧(－x)＜－0.5
    25（26-x）+50x≥875
    x-1/2
    3x^2+2x-1≥0
    2X1＋3X2＋4X3≦8 4X1＋2X2＋2X3≦7
    (99k-10)/20k>0
    x2－1＞0
    x2－1＜x
    x2－4＞0
    x2－4＜1/2
    1/(1-x)<1

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