1-x/3小于等于5/6
    1/3-x小于等于5/6
    26700+x-x*10%/12*3≥50000
    26700+w*(1-10%/4)=50000
    26700+w*(1-10%/4)≥50000
    10x+15(80-x)<900
    （87－4x）x3＝69＋x
    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

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