=1/2
=1/4
=2/9
=2/5
=7/9
=2/3
=3/4
--------------------------------------
16/18<17/18 8/9<17/18</p>
18/21>17/21 6/7>17/21
35/60<44/60 7/12<11/15</p>
35/63<36/63 5/9<4/7</p>
42/90<65/90 7/15<13/18</p>
49/252<66/252 7/36<11/42</p>
----------------------------------------------------
1/4 3/8 7/9 5/6
--------------------------------------
x<5 1/6 х∈(-∞;5 1/6 )</p>