Question

help pls kết quả lạ lắm

 

Answer 1

\(\left(\sqrt{18}+\sqrt{20}-\sqrt{8}\right)\sqrt{2}-2\sqrt{10}\\ =\left(3\sqrt{2}+2\sqrt{5}-2\sqrt{2}\right)\sqrt{2}-2\sqrt{10}\\ =6+2\sqrt{10}-4-2\sqrt{10}=2\)

Answer 2

\(\left(\sqrt{18}+\sqrt{20}-\sqrt{8}\right)\sqrt{2}-2\sqrt{10}=\left(3\sqrt{2}+2\sqrt{5}-2\sqrt{2}\right)\sqrt{2}-2\sqrt{10}=6+2\sqrt{10}-4-2\sqrt{10}=2\)

Answer 3

\(\left(\sqrt{18}+\sqrt{20}-\sqrt{8}\right)\sqrt{2}-2\sqrt{10}=6+2\sqrt{10}-4-2\sqrt{10}=2\)

Answer 4

Ta có: \(\left(\sqrt{18}+\sqrt{20}-\sqrt{8}\right)\cdot\sqrt{2}-2\sqrt{10}\)

\(=\left(3\sqrt{2}-2\sqrt{2}+2\sqrt{5}\right)\cdot\sqrt{2}-2\sqrt{10}\)

\(=2\)