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
    3*x^2+40-500x <0
    3*x^2+40-500x<0
    3x/4-1<3-5x/4
    5X≤2（X+3）
    a+8<8*2
    4x^2+4x+1<0
    9x^2-6x+1<0

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