Question

Answer 1

Có đc rút gọn ko bn

Answer 2

3 - \(2\sqrt{2}\)

= 3 - 2,83

= 0,17

4 + \(2\sqrt{3}\)

= 4 + 3,46

= 7,46

4 - \(2\sqrt{3}\)

= 4 - 3,46

= 0,54

Answer 3

\(a\sqrt{a}+1=\left(\sqrt{a}+1\right)\left(a-\sqrt{a}+1\right)\)

\(a\sqrt{a}-1=\left(\sqrt{a}-1\right)\left(a+\sqrt{a}+1\right)\)