2: 11<16
=>\(\sqrt{11}<\sqrt{16}\)
=>\(\sqrt{11}<4\)
3: 64>61
=>\(\sqrt{64}>\sqrt{61}\)
=>\(-\sqrt{64}<-\sqrt{61}\)
=>-8<\(-\sqrt{61}\)
4: \(\sqrt2<\sqrt4\)
=>\(\sqrt2<2\)
=>\(\sqrt2+1<2+1\)
=>\(\sqrt2+1<3\)
5: 2>\(\sqrt2\)
=>\(2-\sqrt2>0\)
=>\(1-\sqrt2+1>0\)
=>\(1-\sqrt2>-1\)

