$\frac{-5}{9} . \frac{-6}{13} + \frac{5}{-9} . \frac{-5}{13} - \frac{5}{9}$
= $\frac{-5}{9} . \frac{-6}{13} + \frac{-5}{9} . \frac{-5}{13} + \frac{-5}{9} . 1$
= $\frac{-5}{9} . (\frac{-6}{13} + \frac{-5}{13} + 1)$
= $\frac{-5}{9} . 0$
= $0$
Cho mk câu trả lời hay nhất nhé bạn