\(\frac{1}{5}\div\frac{1}{10}-\frac{1}{3}\cdot\left(\frac{6}{5}-\frac{9}{4}\right)^2=2-\frac{1}{3}\cdot-\frac{21}{20}^2\)
\(=2-\frac{1}{3}\cdot\frac{441}{400}\)
\(=2-\frac{147}{400}=\frac{800}{400}-\frac{147}{400}=\frac{653}{400}\)
Chúc chị/anh học tốt.
\(\frac{1}{5}:\frac{1}{10}-\frac{1}{3}\left(\frac{6}{5}-\frac{9}{4}\right)^2\)
\(=2-\frac{1}{3}\left[\frac{\left(-21\right)}{20}\right]^2\)
\(=2-\frac{1}{3}\cdot\frac{441}{400}\)( số âm. số âm = số dương )
\(=2-\frac{147}{400}\)
\(=\frac{800-147}{400}\)
\(=\frac{653}{400}=1\frac{253}{400}=1,6325\)
\(\frac{1}{5}:\frac{1}{10}-\frac{1}{3}\left(\frac{6}{5}-\frac{9}{4}\right)^2\)
\(=\frac{1}{5}.10-\frac{1}{3}\left(\frac{24}{20}-\frac{45}{20}\right)^2\)
\(=2-\frac{1}{3}\left(\frac{-21}{20}\right)^2\)
\(=2-\frac{1}{3}.\frac{441}{400}\)
\(=2-\frac{147}{400}\)
\(=\frac{800}{400}-\frac{147}{400}\)
\(=\frac{653}{400}\)
