Question

X x 3/7 + X x 4/7 = 8/13

Answer 1

x.3/7+x.4/7=8/13

x.(3/7+4/7)=8/13

x.1=8/13

x=8/13:1

x=8/13

Answer 2

\(x.\frac{3}{7}+x.\frac{4}{7}=\frac{8}{13}\)

\(x.\left(\frac{3}{7}+\frac{4}{7}\right)=\frac{8}{13}\)

\(x.1=\frac{8}{13}\)

\(x=\frac{8}{13}:1\)

\(x=\frac{8}{13}\)

P/s : Dấu * chấm * là dấu nhân nhé.