Question

Answer 1

\(=5\sqrt{2}-6\sqrt{2}+20\sqrt{2}=21\sqrt{2}\)

Answer 2

\(=4\sqrt{2}-6\sqrt{2}+20\sqrt{2}=18\sqrt{2}\)

Answer 3

:))) gì vậy

Answer 4

\(=5\sqrt{2-6\sqrt{2+20\sqrt{2=21\sqrt{2}}}}\)