1000+500x<600x+600
    5x+7-6x+6<3 5x+7-6x+6>=0
    20a+4500-15a<=5000
    15a+6000-20a<=5000
    4x-2>3x-3
    2x-8<=-2
    8÷x＞-x+2
    x+1≥0 2x-1≥0
    x/-5+1-4x/5+1>5
    -50x≤-200
    -5x≤-200
    [0.16+0.4(1/sin x-1)]<28
    12-2x<2x
    5/3x-3x<=-10
    5/3x<=3x-10
    -2-x大于等于-3
    x-1/7<2x+5/3
    (x+3)/5>2x+3 (x+3)/5>1-x
    -3(x-2)>=4-x (1+2x)/3>x-1
    -3/k＞2

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