75
    2/x-1-3/x+1≥4/x-2-1
    (2.6-2)a+(2-1.6)(65-a)≥33.6
    2a+1.6(65-a)≤120
    4x-2<6 4x+3>7
    4x-2<6
    （2-x）^（1/3）+√（x-1）>1
    √（9-x^2）+√（6x-x^2）>3
    0≤2x-1≤1
    -1<2+x≤2
    1<-2x+1<6
    (x-3)/2+3≥8 1-3(x-1)<8-x
    (x-1)÷2－（5x+2）÷4≥1
    x-1≤1
    （x+1）（x－2）<0
    abs（2x-1）≤5
    4（x-0.3）<0.5x＋5.8
    1-3/2x≥x-8/3
    5x+7>3(x+1)
    -0.25+0.5x

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