Question

Mọi người giúp  em với ạ câu 7 ý

Answer 1

a.   \(\dfrac{\sqrt{4-2\sqrt{3}}}{1-\sqrt{3}}=\dfrac{\sqrt{\left(\sqrt{3}-1\right)^2}}{1-\sqrt{3}}=\dfrac{\sqrt{3}-1}{1-\sqrt{3}}=-1\)

b.     \(\dfrac{3}{\sqrt{2}-1}-\dfrac{3}{\sqrt{2}+1}\)

    \(=\dfrac{3\left(\sqrt{2}+1\right)}{2-1}-\dfrac{3\left(\sqrt{2}-1\right)}{2-1}\)

    \(=3\sqrt{2}+3-3\sqrt{2}+3\)

    \(=6\)