Question

tại sao \(6\sqrt{\dfrac{a}{4}}=\dfrac{6}{2}\sqrt{a}\)

Answer 1

Ta có:

\(VT=6\sqrt{\dfrac{a}{4}}=6.\dfrac{\sqrt{a}}{\sqrt{4}}=\dfrac{6\sqrt{a}}{2}=\dfrac{6}{2}\sqrt{a}=VP\)

Vậy \(6\sqrt{\dfrac{a}{4}}=\dfrac{6}{2}\sqrt{a}\) (đpcm)

Chúc bạn học tốt!!!

Answer 2

\(6\sqrt{\dfrac{a}{4}}=6\cdot\dfrac{\sqrt{a}}{\sqrt{4}}=6\cdot\dfrac{\sqrt{a}}{2}=6\cdot\sqrt{a}\cdot\dfrac{1}{2}=6\cdot\dfrac{1}{2}\cdot\sqrt{a}=\dfrac{6}{2}\sqrt{a}\)