Question

[Trần thị ánh ngọc]

Giải kiểu j ạ

Answer 1

[Nguyễn Let]

a.\(5+2\sqrt{6}\)\(=\frac{10+4\sqrt{6}}{2}\)\(=\frac{2^2+2.2.\sqrt{6}+\left(\sqrt{6}\right)^2}{2}\)\(=\frac{\left(2+\sqrt{6}\right)^2}{2}\)

Answer 2

[Nguyễn Huy Tú]

a, \(5+2\sqrt{6}=5+2\sqrt{2.3}=\left(\sqrt{2}\right)^2+2\sqrt{2.3}+\left(\sqrt{3}\right)^2=\left(\sqrt{2}+\sqrt{3}\right)^2\)

b, \(8+2\sqrt{15}=\left(\sqrt{5}+\sqrt{3}\right)^2\)

c, \(7-2\sqrt{10}=\left(\sqrt{5}-\sqrt{2}\right)^2\)