6000x+(40-x)4000≤20800 1000x+800(40-x)≥36000
    6000x+(40-x)4000≤20800
    x*100*0.8+5000>x*65+7300
    2>x
    a/11+1/11+2a/11-2/11>3a/11+3/11-5a/11+5/11
    4<5/a ≤5
    4<5/a<5
    （2x-1)/3-(3x-1)/2>5/12
    -1/2（3-a）＞0
    -1/2（2-a）＞0
    7-2x<=1
    x-1≥（2x-1）/3
    5-a>=4a
    3-a＞1
    3x-3≤6
    8-x>0
    6≤3x+2
    x-12＞3-2x
    -x+2≥-3
    3x-1＞5

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