a×45+(6－a)×30≥240
    400a×45+(6－a)×280×30≥240
    6+2*x<=0
    x+1÷2>2x-1
    (x+50%x)x90%-50=1000+x
    (48-40)a+(31-25)*(50-a)>360
    (x-50)(50+(100-x)5)>2500
    —3 ≤（—2x+3 ÷5）<1
    8a*a-4a-1>0
    3x-8>4-x
    0.5x-2>1.5x-5
    (4x+2)/5≥(x－1)/2
    2x+6>7x－4
    (x+2)/2-1
    2-3x<5-x
    (x+3)/5<(2x-5)/3-1
    1/2x≤2+1/3x
    1/2x≤2+1/3
    x＋5≤4x-4
    3x＋5>x-1

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