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![](https://rs.olm.vn/images/avt/0.png?1311)
a/ \(\sqrt{a^4b^5}=a^2b^2\sqrt{b}\)
b/ \(\sqrt{a^6b^{11}}=a^3b^5\sqrt{b}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=\sqrt{2^5\cdot3\cdot5^3}=2^2\cdot5\cdot\sqrt{2\cdot3\cdot5}=20\sqrt{30}\)
b: \(=a^2b^2\sqrt{b}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\sqrt{48\cdot45}=12\sqrt{15}\\ \sqrt{225\cdot17}=15\sqrt{17}\\ \sqrt{a^3b^7}=\left|ab^3\right|\sqrt{ab}=ab^3\sqrt{ab}\\ \sqrt{x^5\left(x-3\right)^2}=\left|x^2\left(x-3\right)\right|\sqrt{x}=x^2\left(x-3\right)\sqrt{x}\)
\(\sqrt{48\cdot45}=4\sqrt{3}\cdot3\sqrt{5}=12\sqrt{15}\)
\(\sqrt{225\cdot17}=15\sqrt{17}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, Để A nhận giá trị dương thì \(A>0\)hay \(x-1>0\Leftrightarrow x>1\)
b, \(B=2\sqrt{2^2.5}-3\sqrt{3^2.5}+4\sqrt{4^2.5}\)
\(=4\sqrt{5}-9\sqrt{5}+16\sqrt{5}=\left(4-9+16\right)\sqrt{5}=11\sqrt{5}\)
( theo công thức \(A\sqrt{B}=\sqrt{A^2B}\))
c, Với \(a\ge0;a\ne1\)
\(C=\left(\frac{1-a\sqrt{a}}{1-\sqrt{a}}+\sqrt{a}\right)\left(\frac{1-\sqrt{a}}{1-a}\right)^2\)
\(=\left(\frac{\left(1-\sqrt{a}\right)\left(1+\sqrt{a}+a\right)}{1-\sqrt{a}}+\sqrt{a}\right)\left(\frac{1-\sqrt{a}}{\left(1-\sqrt{a}\right)\left(1+\sqrt{a}\right)}\right)^2\)
\(=\left(\sqrt{a}+1\right)^2.\frac{1}{\left(\sqrt{a}+1\right)^2}=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\sqrt{18b^3\cdot\left(1-2a\right)^2}\)
\(=3\sqrt{2}\cdot b\sqrt{b}\cdot\left|1-2a\right|\)
\(=3\sqrt{2}\left(2a-1\right)\cdot b\sqrt{b}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1,\sqrt{4\left(a-4\right)^2}\left(dkxd:a\ge4\right)\)
\(=\sqrt{4}.\sqrt{\left(a-4\right)^2}\)
\(=\sqrt{2^2}.\left|a-4\right|\)
\(=2\left(a-4\right)\)
\(=2a-8\)
\(2,\sqrt{9\left(b-5\right)^2}\left(dkxd:b< 5\right)\)
\(=\sqrt{9}.\sqrt{\left(b-5\right)^2}\)
\(=\sqrt{3^2}.\left|b-5\right|\)
\(=3\left(-b+5\right)\)
\(=-3b+15\)
\(\sqrt{96}.\sqrt{125}\)
\(\sqrt{16.6}\sqrt{25.5}\)
\(4.5\sqrt{6.5}\)
\(20\sqrt{30}\)
\(b,\sqrt{a^4b^5}\)
\(a^2b^2\sqrt{b}\)
\(c,\sqrt{a^6b^{11}}\)
\(a^3b^5\sqrt{b}\)
\(d,\sqrt{a^3\left(1-a\right)^4}\)
\(a\left(1-a\right)^2\sqrt{a}\)