(x-3)/2+3 >= x 1-3(x-1)<8-x
    x/3<(x-3)/2
    2(x-2)>5(x+1)
    510.4+128.5n＞10×（110.4-3.7n）
    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

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