160x^2-100x+826<0
    log(.5,x)＞6
    log(.5,x)＞7
    log(.5,x)＞8
    log(.5,x)＞9
    log(.5,x)＞10
    log(.5,x)＞11
    log(.5,x)＞12
    log(.5,x)＞5
    100z+60×2z≥11000
    z+60×2z≥11000
    z+60×(36000-z)≥11000
    ax^2+ax+1＞0
    (x-2/1)^>0
    -2＜（y-4)/(1-y)＜-1
    7.958-y-y*3%*0.25≥3
    7.958-y-y×3%×3/12≥3
    2＞3
    xx＜0
    27a2-54a+23＜0

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