2/x≤7
    (10x)/(5x+2)>8
    10x/5x+2>8
    10x/5x+2>1
    4.8<1080/x<5
    1080/4>x>1080/5
    x>1080/5
    1080/x>720/144
    1080/x<720/144
    4<1080/x<720/144
    0<1080/x<720/144
    0
    x<720/144
    2240/x<481/45
    1/x<481/45
    x<1280/144+1.8
    0<2240/x<1 x<1280/140+1.8
    0<2240/x<1280/140+1.8
    0
    0＜x<1280/140+1.8

Home page << page938 page939 page940 page941 page942 ... ... page953page page954page page955page page956page page957page >> Last page 1275 pages in total