x+3>6-2x
    30-x≥0
    (x-1)^2/(x+1)^2<0.005
    20x+15（16000-x）≤【50x+60（16000-x）】*30%
     5x+1000-10x<760
    abs(x+1)-abs(x-2)<-1
    1-√2m+24/49m^2＞0
    2-2m+24/49m^2＞0
    48-4x+8>2x
    5x-10>2x-4
    3.2/x+1.4x/x<2
    5x-12小于等于2（4x-3）
    24-2x+4>x
    3.2+1.4x<2x
    3.2+1.4x/x<2
    1/2x<0
    -x>7
    -x>-4
    2（2x+x）>24
    2x^2-x-10<0

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