Question

 

\(\dfrac{x}{3}=\dfrac{2}{3}+\dfrac{-1}{7}\)

tìm x

Answer 1

\(\dfrac{x}{3}=\dfrac{2}{3}+-\dfrac{1}{7}\)

\(\Rightarrow\dfrac{x}{3}=\dfrac{2\cdot7+\left(-1\right)\cdot3}{21}\)

\(\Rightarrow\dfrac{x}{3}=\dfrac{11}{21}\)

\(\Rightarrow x=\dfrac{33}{21}\)

Answer 2

\(\dfrac{x}{3}=\dfrac{2}{3}+\dfrac{-1}{7}\)

\(\dfrac{x}{3}=\dfrac{14}{21}+\dfrac{-3}{21}\)

\(\dfrac{x}{3}=\dfrac{11}{21}\)

x.11= 21.3

x.11= 63

x     = 63/11

Vậy x= 63/11

Answer 3

⇒x/3=2⋅7+(−1)⋅321

⇒x=33/21

Answer 4

⇒x/3=2⋅7+(−1)⋅3/21

⇒x=33/21

Answer 5

\(\dfrac{x}{3}=\dfrac{2}{3}+\dfrac{-1}{7}\)

\(\dfrac{x}{3}=\dfrac{11}{21} \)

\(x=\dfrac{3.11}{21}\)

➩\(x=\dfrac{11}{7}\)