Question

Tính

A=\(\left(12\sqrt{50}-8\sqrt{200}+7\sqrt{450}\right):\sqrt{10}\)

Answer 1

\(=12\sqrt{5}-8\sqrt{20}+7\sqrt{45}\)

\(=12\sqrt{5}-16\sqrt{5}+21\sqrt{5}\)

\(=17\sqrt{5}\)

Answer 2

`A = (60 sqrt 2 - 80 sqrt 2 + 105 sqrt 2) : sqrt 10`

`= 85 sqrt 2 : sqrt 10`

`= 17 xx sqrt 5 xx sqrt 5 xx sqrt 2 : sqrt 2 : sqrt 5`

`= 17 sqrt 5`