Question

tìm x 

9/7 x x + 5/7 x x = 2/3

Answer 1

=>x(9/7+5/7)=2/3

=>2x=2/3

hay x=1/3

Answer 2

\(\dfrac{9}{7}\times x+\dfrac{5}{7}\times x=\dfrac{2}{3}\)

\(\dfrac{14}{7}\times x=\dfrac{2}{3}\)

\(2x=\dfrac{2}{3}\)

\(x=\dfrac{2}{3}:2=\dfrac{1}{3}\)

Answer 3

=>x x(9/7+5/7)=2/3

x x 2                =2/3 

x                     =2/3 : 2

x=1/3

Answer 4

\(\dfrac{1}{3}\)