18x+26（8—x）≥165 18x+26（8—x）≤190
    x+4/1-x<0
    (x+1)(x-3)<0
    <0=
    400(8000+5x-5000)≤5000000
    4000(8000+5x-5000)≤5000000
    8000+5x-5000≤5000000/4000
    8000+5x-5000≤5000000
    9-3a+2/2>6/3
    350×15+20y≤10000
    {x+1/5<3-x/5 {2x-2/3>x/3+x-2/4
    x-8<4x+1
    5x-6>4
    x+3/5<2x-4/3+1
    5x+1≤3x-1
    50x+40(40-x)≤2295
    2x－140=2628900
    3-(x-1)/4>=2+3(x+1)/8
    2+7a>9
    -3a+5≥0

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