√6-6 √6(1-√6) √2 * √3 1
------------- = --------------- = ------------- = -------
2√3-6√2 2√3(1-√6) 2 * √3 √2
2) 11 7 18 + - +
------------ + ------------- <0, ------------ <0, ⇒ х(х-5)<0 --------(0)--------(5)-------</p>
х(х-5) х(х-5) х(х-5)
х∈(0,5)