logex<1
    0.6x+90+60=1.4(0.4x+90+60)
    2x/3-1<1
    2x/3-1>-3x
    1/312.2-1/（x-80）＝1/88-1/（x-390）
    1/312.2-1/（80-x）＝1/88-1/（390-x）
    1/312.2-1/80-x＝1/88-1/390-x
    2x-3<4x+1
    -31x+1231.2≥0
    30x-1203.6≥0
    3.5a+5*（20-a）≤90
    5a+3(24-a)≤100
    5a+3(24-a)≤a100
    35≤a≤3(50-a)
    （x-4）÷2+4>x+1
    1-3（x-2）≤8-x
    250000+4500（b-50）≥400000
    x-2x≤ 0
    1500b+260（130-b）≤58600
    lnx+x+1<0

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