Question

BT. RÚT GỌN

1.( với a >=3 )\(\sqrt{\frac{24}{3}}\times\sqrt{\frac{3a}{8}}\)

2. ( với a>3 )\(\sqrt{13a}\times\sqrt{\frac{52}{a}}\)

3. ( với a >=0 )\(\sqrt{5a}\times\sqrt{45a}-3a\)

4. ( 3-a )²-\(\sqrt{0,2}\times\sqrt{180a^2}\)

GIÚP MÌNH VỚI!!!!!!!HHHH

Answer 1

1) \(\sqrt{\frac{24}{3}}\cdot\sqrt{\frac{3a}{8}}=\sqrt{\frac{72a}{24}}=\sqrt{3a}\)

2) \(\sqrt{13a}\cdot\sqrt{\frac{52}{a}}=\sqrt{\frac{13a\cdot52}{a}}=\sqrt{676}=26\)

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

4) \(\left(3-a\right)^2-\sqrt{0,2}\cdot\sqrt{180a^2}=a^2-6a+9-\sqrt{36a^2}=a^2-6a+9-6a=a^2-12a+9\)