Question

: tìm x biết : 2/7 * x + 1/2 * x = 1

Answer 1

dấu chấm là nhân nha

\(\dfrac{2}{7}\cdot x+\dfrac{1}{2}\cdot x=1\\ \left(\dfrac{2}{7}+\dfrac{1}{2}\right)\cdot x=1\\ \left(\dfrac{4}{14}+\dfrac{7}{14}\right)\cdot x=1\\ \dfrac{11}{14}\cdot x=1\\ x=1:\dfrac{11}{14}\\ x=\dfrac{14}{11}\)

 

 

 

 

 

 

 

 

 

 

 

Answer 2

`2/7 xx x + 1/2 xx x = 1`

`=> x xx ( 2/7 + 1/2 ) = 1`

`=> x xx (4/14 + 7/14 ) = 1`

`=> x xx 11/14 = 1`

`=> x = 1 : 11/14`

`=> x = 1 xx 14/11`

`=> x = 14/11`

Answer 3