Question

[Nguyễn Tiến Minh]

Answer 1

[⭐Hannie⭐]

\(a,x\times\left(\dfrac{1}{2}+\dfrac{1}{3}\right)=\dfrac{9}{8}\\ x\times\left(\dfrac{3}{6}+\dfrac{2}{6}\right)=\dfrac{9}{8}\\ x\times\dfrac{5}{6}=\dfrac{9}{8}\\ x=\dfrac{9}{8}:\dfrac{5}{6}\\ x=\dfrac{9}{8}\times\dfrac{6}{5}\\ x=\dfrac{54}{40}\\ x=\dfrac{27}{20}\)

\(\left(\dfrac{7}{6}-\dfrac{4}{5}\right)\times x=\dfrac{5}{8}\\ \left(\dfrac{35}{30}-\dfrac{24}{30}\right)\times x=\dfrac{5}{8}\\ \dfrac{11}{30}\times x=\dfrac{5}{8}\\ x=\dfrac{5}{8}:\dfrac{11}{30}\\ x=\dfrac{5}{8}\times\dfrac{30}{11}\\ =x=\dfrac{150}{88}\\ x=\dfrac{75}{44}\)

Answer 2

[animepham]

`a/`

` x xx ( 1/2 + 1/3 ) = 9/8 `

` x xx  5/6 = 9/8 `

` x = 9/8 : 5/6 `

` x = 9/8 xx 6/5 `

`x = 27/20 `

Vậy ` x= 27/20 `

`b/`

` (7/6 - 4/5 ) xx x = 5/8 `

` 11/30 xx x = 5/8 `

` x = 5/8 : 11/30 `

` x = 5/8 xx 30/11 `

` x = 75/44 `

Vậy ` x=75/44`