= (3/7 + 4/7) + (8/13 + 18/13) + (7/9 + 11/9)
= 7/7 + 26/3 + 18/9
= 1 + 2+ 2
=5
=(3\7+4\7)+(8\13 +18|13)+(7\9+11\9)
=7\7+26\13+18\9
=1+2+2
=5
\(\frac{3}{7}+\frac{8}{13}+\frac{7}{9}+\frac{4}{7}+\frac{18}{13}+\frac{11}{9}\)
\(=\left(\frac{3}{7}+\frac{4}{7}\right)+\left(\frac{8}{13}+\frac{18}{13}\right)+\left(\frac{7}{9}\cdot\frac{11}{9}\right)\)
\(=1+2+2\)
\(=5\)
\(\frac{3}{7}+\frac{8}{13}+\frac{7}{9}+\frac{4}{7}+\frac{18}{13}+\frac{11}{9}\)
\(=\)\(\left(\frac{3}{7}+\frac{4}{7}\right)+\left(\frac{8}{13}+\frac{18}{13}\right)+\left(\frac{7}{9}+\frac{11}{9}\right)\)
\(=\) \(\frac{7}{7}+\frac{26}{13}+\frac{18}{9}\)
\(=\) \(1+2+2\)
\(=\) \(5\)