x+1/2＜2
    x-1≥3-x
    278x>5000sinx
    278x<500sinx
    278x<5000sinx
    x/sin(x)<500
    x/sin(x)<50000
    x/sin(x)<5000
    77.2x<2sin(x)
    77.2x<100sin(x)
    x+0.5+0.5+x/2+0.5+1＜9
    1.544x<100sin(x)
    (x/2+0.5)+(x/2+0.5)＜9
    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

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