Question

$$135 \sqrt{ \frac{ 135 }{ 135 \times 9 \times } }$$

Answer

45

Solution


Simplify  \(135\times 9\)  to  \(1215\).
\[135\sqrt{\frac{135}{1215}}\]
Simplify  \(\sqrt{\frac{135}{1215}}\)  to  \(\frac{\sqrt{135}}{\sqrt{1215}}\).
\[135\times \frac{\sqrt{135}}{\sqrt{1215}}\]
Simplify  \(\sqrt{135}\)  to  \(3\sqrt{15}\).
\[135\times \frac{3\sqrt{15}}{\sqrt{1215}}\]
Use this rule: \(\sqrt{ab}=\sqrt{a}\sqrt{b}\).
\[135\times \frac{3\sqrt{15}}{\sqrt{1215}\sqrt{1}}\]
Simplify  \(\sqrt{1215}\)  to  \(9\sqrt{15}\).
\[135\times \frac{3\sqrt{15}}{9\sqrt{15}\sqrt{1}}\]
Simplify  \(\sqrt{1}\)  to  \(1\).
\[135\times \frac{3\sqrt{15}}{9\sqrt{15}\times 1}\]
Simplify  \(9\sqrt{15}\times 1\)  to  \(9\sqrt{15}\).
\[135\times \frac{3\sqrt{15}}{9\sqrt{15}}\]
Cancel \(\sqrt{15}\).
\[135\times \frac{3}{9}\]
Use this rule: \(a \times \frac{b}{c}=\frac{ab}{c}\).
\[\frac{135\times 3}{9}\]
Simplify  \(135\times 3\)  to  \(405\).
\[\frac{405}{9}\]
Simplify.
\[45\]