Question

Answer 1

a: Ta có: \(5\sqrt{a}+6\sqrt{\dfrac{a}{4}}-a\sqrt{\dfrac{4}{a}}+\sqrt{5}\)

\(=5\sqrt{a}+3\sqrt{a}-2\sqrt{a}+\sqrt{5}\)

\(=6\sqrt{a}+\sqrt{5}\)

Answer 2

b: Ta có: \(5\sqrt{a}-4b\sqrt{25a^3}+5a\sqrt{16ab^2}-\sqrt{9a}\)

\(=5\sqrt{a}-20ab\sqrt{a}+20ab\sqrt{a}-3\sqrt{a}\)

\(=2\sqrt{a}\)