Question

Giúp mình ạ

Answer 1

a) \(\sqrt{\dfrac{2a}{3}}\cdot\sqrt{\dfrac{3a}{8}}=\sqrt{\dfrac{6a^2}{24}}=\sqrt{\dfrac{a^2}{4}}=\dfrac{a}{2}\)

b) \(\sqrt{13a}\cdot\sqrt{\dfrac{52}{a}}=\sqrt{13a\cdot\dfrac{52}{a}}=\sqrt{13\cdot52}=26\)

Answer 2

c) \(\sqrt{5a}\cdot\sqrt{45a}-3a=\sqrt{225a^2}-3a=15a-3a=12a\)

d) \(\left(3-a\right)^2-\sqrt{0.2}\cdot\sqrt{180a^2}=\left(a-3\right)^2-6a=a^2-6a+9-6a=a^2-12a+9\)