Tính giá trị phép tính: - 4/9 .13/17 - 4/34 . 4/9 - 4/18 . 4/17

\(-\frac{4}{9}\ .\ \frac{13}{17}-\frac{4}{34}.\ \frac{4}{9}-\frac{4}{18}\ .\ \frac{4}{17}\)

=\(-\frac{4}{9}\ .\ \frac{13}{17}-\frac{4}{34}.\ \frac{4}{9}-\frac{4}{9}\ .\ \frac{1}{2}\ .\ \frac{4}{17}\)

\(=-\frac{4}{9}\ .\ \frac{13}{17}-\frac{4}{34}.\ \frac{4}{9}-\frac{4}{9}\ .\ \frac{4}{34}\)

\(=-\frac{4}{9}\ .\ \frac{13}{17}-2.\frac{4}{34}.\ \frac{4}{9}\)

\(=-\frac{4}{9}\ .\ \frac{13}{17}-\frac{4}{17}.\ \frac{4}{9}\)

\(=\frac{4}{9}\left(-\ \frac{13}{17}-\frac{4}{17}\right)=\frac{4}{9}.\left(-1\right)=-\frac{4}{9}\)

- 4/9 .13/17 - 4/34 . 4/9 - 4/18 . 4/17

= - 4/9 .13/17 - 4/34 . 4/9 - 4/9 . 4/34

= 4/9 . (-13/17 - 4/34 - 4/34)

= 4/9 . (-13/17 - 4/17)

= 4/9 . (-1)

= -4/9

= -4/9