26/26+x≤30%
    －2（1/3x－1/4x）+1≤x
    20（n-1)<12n+10
    20（n-1)<12n+10<20n
     6x+5-sqrt((6x+5)^2-4(6x+4))≥0
     6x+5+sqrt((6x+5)^2-4(6x+4))≥0
    (x+1)/(4-2x)<1^-1
    (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

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