（4a+1）÷（a+1）＜3
    -2
    x/x>0
    （2+lga）lga-3≤1000
    a^（2+lga）≤1000
    a^2+lga≤1000
    (x-1)/(x+1)>0
    0
    1
    1+2/5x＞2x-4
    (48-t)*20+t*80 <=2000
    3x+7-5x+3≥-3
    (3x+7)-(5x-3)≥-3
    1/9200
    x/10000+(1-x)/2000
    1/9200>x/9800+(1-x)/7800
    x/10000+(1-x)/2000<1/9200
    x/9800+(1-x)/7800>1/9200
    x^2-24x+80>0
    -1/4x^2+6x+48<68

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