\(\frac{-5}{9}.\frac{13}{28}-\frac{13}{28}.\frac{4}{9}\)
\(=\frac{13}{28}.\left(\frac{-5}{9}-\frac{4}{9}\right)\)
\(=\frac{13}{28}.\left(-1\right)\)
\(=\frac{-13}{28}\)
\(\frac{-5}{9}.\frac{13}{28}-\frac{13}{28}.\frac{4}{9}\)
\(=\frac{13}{28}.\left[\frac{\left(-5\right)}{9}+\frac{4}{9}\right]\)
\(=\frac{13}{28}.\left(-1\right)\)
\(=-\frac{13}{28}\)
\(-\frac{5}{9}.\frac{13}{28}-\frac{13}{28}.\frac{4}{9}\)
\(=\left(\frac{5}{9}+\frac{4}{9}\right)-\frac{13}{28}\)
\(=1.\left(-\frac{13}{28}\right)=\frac{-13}{28}\)
-5/9.13/28-13/28.4/9
=13/28.(-5/9-4/9)
=13/28.-1
=-13/28
