\(-\dfrac{29}{39}\)

\(\dfrac{5}{9}\times\dfrac{-7}{13}+\dfrac{5}{9}\times\dfrac{-9}{13}+\dfrac{5}{9}-\dfrac{3}{13}=-\dfrac{29}{39}\)

\(\dfrac{5}{9}.\dfrac{-7}{13}+\dfrac{5}{9}.\dfrac{-9}{13}+\dfrac{5}{9}-\dfrac{3}{13}\)

= \(\dfrac{5}{9}.\left(\dfrac{-7}{13}+\dfrac{-9}{13}-\dfrac{3}{13}\right)\)

\(=\dfrac{5}{9}.\dfrac{-19}{13}\)

\(=\dfrac{-95}{117}\)

ta có \(\frac{\frac{4}{5}-\frac{4}{11}+\frac{4}{13}}{\frac{9}{5}-\frac{9}{11}+\frac{9}{13}}+\frac{\frac{5}{7}+\frac{5}{11}-\frac{5}{13}}{\frac{9}{7}+\frac{9}{11}-\frac{9}{13}}\)

       \(=\frac{4\left(\frac{1}{5}-\frac{1}{11}+\frac{1}{13}\right)}{9\left(\frac{1}{5}-\frac{1}{11}+\frac{1}{13}\right)}+\frac{5\left(\frac{1}{7}+\frac{1}{11}-\frac{1}{13}\right)}{9\left(\frac{1}{7}+\frac{1}{11}-\frac{1}{13}\right)}\)

           \(=\frac{4}{9}+\frac{5}{9}=\frac{9}{9}=1\)

\(\dfrac{5}{9}\cdot\dfrac{7}{13}+\dfrac{5}{9}\cdot13-\dfrac{5}{9}\cdot\dfrac{3}{13}\)

\(=\dfrac{5}{9}\cdot\left(\dfrac{7}{13}-\dfrac{3}{13}+13\right)\)

\(=\dfrac{5}{9}\cdot\left(\dfrac{4}{13}+13\right)\)

\(=\dfrac{5}{9}\cdot\dfrac{173}{13}\)

\(=\dfrac{865}{117}\)

=5/9(7/13+13-3/13)

=5/9*(13+4/13)

=5/9*173/13=865/117

\(\dfrac{5}{9}\cdot\dfrac{-7}{13}+\dfrac{5}{9}\cdot\dfrac{-9}{13}+\dfrac{5}{9}\cdot\dfrac{3}{13}\)

\(=\dfrac{5}{9}\cdot\left(\dfrac{-7}{13}+\dfrac{-9}{13}+\dfrac{3}{13}\right)\)

\(=\dfrac{5}{9}\cdot\left(-1\right)\)

\(=-\dfrac{5}{9}\)

= 7/9 . (7/13 + 7/13 - 15/13)

= 7/9 . ( bấm máy tính)

= 7/9 . ( kết quả bấm )

=   Bấm máy tình tiếp

`2/9 xx7/13+(-11/9)xx 7/13 +7/13`

`=2/9 xx7/13+(-11/9)xx 7/13 +7/13 xx 1`

`= 7/13 xx ( 2/9 + (-11)/9 +1)`

`=7/13xx0`

`=0`

\(\dfrac{2}{9}\times\dfrac{7}{13}+\left(-\dfrac{11}{9}\right)\times\dfrac{7}{13}+\dfrac{7}{13}\)

\(=\dfrac{7}{13}\times\left(\dfrac{2}{9}+\dfrac{-11}{9}+1\right)\)

\(=\dfrac{7}{13}\times0\)

\(=0\)

\(\dfrac{12}{17}.\dfrac{9}{13}-\dfrac{7}{15}.\dfrac{6}{13}+\dfrac{5}{17}.\dfrac{9}{13}-\dfrac{8}{15}.\dfrac{6}{13}\)

\(=\dfrac{9}{13}.\left(\dfrac{12}{17}+\dfrac{5}{17}\right)-\dfrac{6}{13}.\left(\dfrac{7}{15}+\dfrac{8}{15}\right)\)

\(=\dfrac{9}{13}.\dfrac{17}{17}-\dfrac{6}{13}.\dfrac{15}{15}\)

\(=\dfrac{9}{13}.1-\dfrac{6}{13}.1\)

\(=\dfrac{9}{13}-\dfrac{6}{13}\)

\(=\dfrac{9-6}{13}\)

\(=\dfrac{3}{13}\)

\(\frac{7}{13}.\frac{5}{9}+\frac{7}{13}.\frac{8}{9}-\frac{14}{26}.\frac{13}{9}\)

\(=\frac{7}{13}.\frac{5}{9}+\frac{7}{13}.\frac{8}{9}-\frac{7}{13}.\frac{13}{9}\)

\(=\frac{7}{13}.\left(\frac{5}{9}+\frac{8}{9}-\frac{13}{9}\right)\)

\(=\frac{7}{13}.0\)

\(=0\)

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