minh văn nguyễn

a) Ta có: \(2\sqrt{3a}-\sqrt{12a^3}-5\cdot\sqrt{\frac{a}{3}}-\frac{1}{4}\cdot\sqrt{27a}\)

\(=2\sqrt{3a}-2a\sqrt{3a}-\frac{5\sqrt{a}}{\sqrt{3}}-\frac{1}{4}\cdot3\sqrt{3a}\)

\(=2\sqrt{3a}-\frac{3}{4}\sqrt{3a}-2a\sqrt{3a}-\frac{5\sqrt{a}}{\sqrt{3}}\)

\(=\frac{5}{4}\sqrt{3a}-2a\sqrt{3a}-5\sqrt{3a}\cdot\frac{1}{3}\)

\(=\frac{5}{4}\sqrt{3a}-\frac{5}{3}\sqrt{3a}-2a\sqrt{3a}\)

\(=\frac{-5}{12}\sqrt{3a}-2a\sqrt{3a}\)

b) Ta có: \(2a\sqrt{b+a}+\left(a+b\right)\cdot\sqrt{\frac{1}{a+b}}-\sqrt{a^3+a^2b}\)

\(=2a\sqrt{a+b}+\sqrt{\left(a+b\right)^2\cdot\frac{1}{a+b}}-a\sqrt{a+b}\)

\(=a\sqrt{a+b}+\sqrt{a+b}\)

\(=\left(a+1\right)\cdot\sqrt{a+b}\)

c) Ta có: \(2\sqrt{a}+5\sqrt{\frac{a}{9}}-a\sqrt{\frac{16}{a}}\cdot\sqrt{a^3}\)

\(=2\sqrt{a}+5\cdot\frac{\sqrt{a}}{3}-4a^2\)

\(=\frac{11}{3}\sqrt{a}-4a^2\)

1. \(\dfrac{1}{2-\sqrt{6}}-\dfrac{1}{2+\sqrt{6}}=\dfrac{2+\sqrt{6}-2+\sqrt{6}}{4-6}=\dfrac{2\sqrt{6}}{-2}=-\sqrt{6}\)

2. \(\sqrt{27a}.\sqrt{3a}=\sqrt{81a^2}=9a\left(a>0\right)\)

1: \(\dfrac{1}{2-\sqrt{6}}-\dfrac{1}{2+\sqrt{6}}\)

\(=\dfrac{2+\sqrt{6}-2+\sqrt{6}}{-2}\)

\(=\dfrac{2\sqrt{6}}{-2}=-\sqrt{6}\)

3: \(\sqrt{27a}\cdot\sqrt{3a}=\sqrt{81a^2}=9a\)

\(1) \sqrt{9a^2.b^2}\)=3ab

\(2) \sqrt{3a}.\sqrt{27a}=\sqrt{3a}.3\sqrt{3a}=9a\)

\(3) \sqrt{3a^5}.12a=12\sqrt{3a^7}\)

\(4) \sqrt{5a}.\sqrt{45a}-3a=15a-3a=12a\)

\(5) \sqrt{3+\sqrt{a}}.\sqrt{3-\sqrt{a}}=\sqrt{(3+\sqrt{a}).(3-\sqrt{a})} =\sqrt{9-a} \)

\(6) \sqrt{3+\sqrt{5}}.\sqrt{3\sqrt{5}} =\sqrt{\sqrt{3\sqrt{5}}.(3+\sqrt{5})} =\sqrt{9+\sqrt{15}}\)

1) \(\sqrt{9a^2b^2}=3ab\)

2) \(\sqrt{3a}\cdot\sqrt{27a}=9a\)

4) \(\sqrt{5a}\cdot\sqrt{45a}-3a=15a-3a=12a\)

a) Ta có: \(A^3=\left(\sqrt[3]{2+\sqrt{5}}+\sqrt[3]{2-\sqrt{5}}\right)^3\)

\(=2+\sqrt{5}+2-\sqrt{5}+3\cdot\sqrt[3]{\left(2+\sqrt{5}\right)\left(2-\sqrt{5}\right)}\left(\sqrt[3]{2+\sqrt{5}}+\sqrt[3]{2-\sqrt{5}}\right)\)

\(=4-3\cdot A\)

\(\Leftrightarrow A^3+3A-4=0\)

\(\Leftrightarrow A^3-A+4A-4=0\)

\(\Leftrightarrow A\left(A-1\right)\left(A+1\right)+4\left(A-1\right)=0\)

\(\Leftrightarrow\left(A-1\right)\left(A^2+A+4\right)=0\)

\(\Leftrightarrow A=1\)

a)

\(\sqrt{\dfrac{27a^4}{48a^2}}=\sqrt{\dfrac{9a^2}{16}}=\sqrt{\left(\dfrac{3a}{4}\right)^2}=\dfrac{3a}{4}\)

b)

\(\dfrac{\sqrt{9x^2-25}}{\sqrt{3x+5}}=\dfrac{\sqrt{\left(3x-5\right)\left(3x+5\right)}}{\sqrt{3x+5}}=\sqrt{3x-5}\)

c)

\(\left(\sqrt{3-\sqrt{5}}+\sqrt{3+\sqrt{5}}\right)^2\\ =\left(3-\sqrt{5}\right)+2.\sqrt{3-\sqrt{5}}.\sqrt{3+\sqrt{5}}+\left(3+\sqrt{5}\right)\\ =2.\sqrt{\left(3-\sqrt{5}\right)\left(3+\sqrt{5}\right)}+6\\ =2.\sqrt{9-5}+6\\ =10\\ \Rightarrow\sqrt{3-\sqrt{5}}+\sqrt{3+\sqrt{5}}=\sqrt{10}\)

d) KO khó!!

a) \(\sqrt{\dfrac{27a^2}{48a^4}}=\sqrt{\dfrac{9}{16a^2}}=\dfrac{3}{4a}\)

b) \(\dfrac{\sqrt{9x^2-25}}{\sqrt{3x+5}}=2\Leftrightarrow\dfrac{\sqrt{\left(3x-5\right)\left(3x+5\right)}}{\sqrt{3x+5}}=2\Leftrightarrow\sqrt{3x-5}=2\Leftrightarrow3x-5=4\Leftrightarrow x=3\)c) \(\sqrt{3-\sqrt{5}}+\sqrt{3+\sqrt{5}}=\dfrac{\sqrt{2}\left(\sqrt{3-\sqrt{5}}+\sqrt{3+\sqrt{5}}\right)}{\sqrt{2}}=\dfrac{\sqrt{6-2\sqrt{5}}+\sqrt{6+2\sqrt{5}}}{\sqrt{2}}=\dfrac{\sqrt{5}-1+\sqrt{5}+1}{\sqrt{2}}=\dfrac{2\sqrt{5}}{\sqrt{2}}=\sqrt{10}\)d) \(\dfrac{a\sqrt{a}+b\sqrt{b}-a\sqrt{b}-b\sqrt{a}}{a+b-2\sqrt{ab}}=\dfrac{a\left(\sqrt{a}-\sqrt{b}\right)-b\left(\sqrt{a}-\sqrt{b}\right)}{\left(\sqrt{a}-\sqrt{b}\right)^2}=\dfrac{\left(a-b\right)\left(\sqrt{a}-\sqrt{b}\right)}{\left(\sqrt{a}-\sqrt{b}\right)^2}=\sqrt{a}+\sqrt{b}\)