2x-6<0 3x-15>0
    2x-6<0
    2x—2>4—x
    10x+15（80-x）≤900
    10x+15（60-x）≤900
    t^(2)-6t+1≤0
    40[120(1+a)}+46[80(1-0.375a)]<9050
    40[120(1+a%)}+46[80(1-0.375a%)]<9050
    3（x+1）-x>=1 x-1<=1/3+2x/3
    x>1
    2x-x^2>1
    -36m×m－36（2m×m－8）≥0
    -36m*－36（2m*－8）≥0
    x>8/1+x
    70x≤80(60－x)
    x(4-x)>=0
    (8000/(x-45))<=1.995*(139200/(0.045*x+4.23))^(1/3)
    (8000/(x-45))>=1.995*(139200/(0.045*x+4.23))^(1/3)
    (8000/(x-45))>5
    3*x^2+40-500x >0

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