\(\left(\sqrt{4,5}-\frac{1}{2}.\sqrt{72}+5\sqrt{\frac{1}{2}}\right).\left(42\sqrt{\frac{25}{6}}-10\sqrt{\frac{3}{2}}-12\sqrt{\frac{98}{3}}\right)\)

=\(\left(\frac{3\sqrt{2}}{2}-3\sqrt{2}+\frac{5\sqrt{2}}{2}\right).\left(35\sqrt{6}-5\sqrt{6}-28\sqrt{6}\right)\)

=\(\left(\frac{3\sqrt{2}-6\sqrt{2}+5\sqrt{2}}{2}\right).2\sqrt{6}\)

=\(2\sqrt{2}.\sqrt{6}=4\sqrt{3}\)

Có nhiều cách xếp

\(\frac{17469}{5823}\)= 3        \(\frac{15768}{3942}\)=4         \(\frac{13845}{2769}\)=5      \(\frac{17658}{2943}\)=6  \(\frac{16758}{2394}\)=7  

\(\frac{25496}{3187}\)=8        \(\frac{57429}{6381}\)=9