300x<100sin(x)
    x/2+1/2+x/2+1/2*50%+1＜9
    x/2+1/2+x/2+1/2+1＜9
    （50-40）×40-（40-32）x≥800
    -8<-8t
    R^2+1＞0
    RR+1＞0
    sin(ex+(sqrt(x-1000))^2-x+1000)＞0
    0.2x>35
    -x+8≤4
    -x+8＜4
    3（4x-1）≤1-5x
    asinacosx＞-2
    -A：1＜1
    -A＜1
    x^2<2x
    lglnx＜0
    lglnx＜1
    C(lnx,lgx)＞0
    C(sinx,cosx)＞0

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