16 và 2/7 chia -3 phần 5 + 28 và 2/7 chia 3/5
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\(\dfrac{3}{5}:\left(-\dfrac{1}{15}-\dfrac{1}{6}\right)+\dfrac{3}{5}:\left(-\dfrac{1}{3}-1\dfrac{1}{15}\right)\)
\(=\dfrac{3}{5}:\left(-\dfrac{2}{30}-\dfrac{5}{30}\right)+\dfrac{3}{5}:\left(-\dfrac{1}{3}-\dfrac{16}{15}\right)\)
\(=\dfrac{3}{5}:\left(-\dfrac{7}{30}\right)+\dfrac{3}{5}:\left(-\dfrac{7}{5}\right)\)
\(=\dfrac{3}{5}.\left[\left(-\dfrac{30}{7}\right)+\left(-\dfrac{5}{7}\right)\right]\)
\(=\dfrac{3}{5}.-5\)
\(=-3\)
\(16\dfrac{2}{7}:-\dfrac{3}{5}+28\dfrac{2}{7}:\dfrac{3}{5}\)
\(=16\dfrac{2}{7}.-\dfrac{5}{3}+28\dfrac{2}{7}.\dfrac{5}{3}\)
\(=-16\dfrac{2}{7}.\dfrac{5}{3}+28\dfrac{2}{7}.\dfrac{5}{3}\)
\(=\dfrac{5}{3}.\left(-16\dfrac{2}{7}+28\dfrac{2}{7}\right)\)
\(=\dfrac{5}{3}.12\)
\(=20\)
\(\left(\dfrac{2}{3}+\dfrac{1}{5}-\dfrac{4}{9}\right):\left(\dfrac{1}{3}+\dfrac{2}{5}-\dfrac{6}{9}\right)\)
\(=\left(\dfrac{30}{45}+\dfrac{9}{45}-\dfrac{20}{45}\right):\left(\dfrac{15}{45}+\dfrac{18}{45}-\dfrac{30}{45}\right)\)
\(=\dfrac{19}{45}:\dfrac{1}{15}\)
\(=\dfrac{19}{3}\)
`7/19 . 8/11 + | 7/19| . 3/11 - 26/19`
` =7/19 . 8/11 + 7/19 . 3/11 - 26/19`
`=7/19 . (8/11 + 3/11) - 26/19`
`=7/19 . 11/11 - 26/19`
`=7/19 . 1 - 26/19`
`=7/19 - 26/19`
`=(7-26)/19`
`= (-19)/19`
`=-1`
= 7/19.( 8/11 + 3/11) - 26/19
= 7/19 . 1 - 26/19
= 7/19 - 26/19
= -1