Tìm phân số hay tìm số tự nhiên được trừ vào cả tử và mẫu hả bạn?

\(\dfrac{1}{30}+\dfrac{1}{42}+\dfrac{1}{56}\)

\(=\dfrac{1}{5.6}+\dfrac{1}{6.7}+\dfrac{1}{7.8}\)

\(=\dfrac{1}{5}-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{8}=\dfrac{1}{5}-\dfrac{1}{8}=\dfrac{8-5}{40}=\dfrac{3}{40}\)

mong mọi người là giúp cho mình ạ

\(\dfrac{4}{5}\times\left(\dfrac{5}{4}-\dfrac{5}{7}\right)\)

\(=\dfrac{4}{5}\times\left(\dfrac{35}{28}-\dfrac{20}{28}\right)\)

\(=\dfrac{4}{5}\times\dfrac{15}{28}\)

\(=\dfrac{3}{7}\)

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\(\dfrac{5}{8}\times\dfrac{9}{7}+\dfrac{5}{8}\times\dfrac{5}{7}\)

\(=\dfrac{5}{8}\times\left(\dfrac{9}{7}+\dfrac{5}{7}\right)\)

\(=\dfrac{5}{8}\times2=\dfrac{10}{8}=\dfrac{5}{4}\)

\(\dfrac{117}{171}=\dfrac{117:9}{171:9}=\dfrac{13}{19}\)

a. 5/6+1/3*2

= 5/6+2/3

= 5/6+4/6

= 10/6

= 5/3

`a, 5/6 + 1/3 xx 2`

`= 5/6 + 2/3`

`= 5/6 + 4/6`

`=9/6`

`=3/2`

`b, 9/11 : (6/7 - 5/6)`

`= 9/11 : ( 36/42 - 35/42)`

`= 9/11 : 1/42`

`=9/11 xx42`

`=378/11`

\(\dfrac{2}{3}+\dfrac{5}{4}\)

\(=\dfrac{8}{12}+\dfrac{15}{12}\)

\(=\dfrac{23}{12}\)

rút gọn đi

`5/8 xx x =3/7`

`=> x= 3/7 : 5/8`

`=> x= 3/7 xx 8/5`

`=> x= 24/35`

\(\dfrac{5}{8}\) x \(x\) = \(\dfrac{3}{7}\)

      \(x\) = \(\dfrac{3}{7}\) : \(\dfrac{5}{8}\)

      \(x\) = \(\dfrac{3}{7}\) x \(\dfrac{8}{5}\)

      \(x\) = \(\dfrac{24}{35}\)