Đ, S? 6/5 - 3/5=6+3/5 = 9/5

a) $\frac{6}{5}-\frac{3}{5}=\frac{6+3}{5}=\frac{9}{5}$ …..

c) $\frac{7}{9}-\frac{2}{9}=\frac{7-2}{9}=\frac{5}{9}$ …..

b) $\frac{11}{8}-\frac{5}{8}=\frac{11-5}{8}=\frac{6}{8}$ …..

d) $\frac{3}{11}-\frac{2}{11}=\frac{3-2}{11-11}=\frac{1}{0}$ …..

a) $\frac{6}{5}-\frac{3}{5}=\frac{6+3}{5}=\frac{9}{5}$ S

c) $\frac{7}{9}-\frac{2}{9}=\frac{7-2}{9}=\frac{5}{9}$ Đ

b) $\frac{11}{8}-\frac{5}{8}=\frac{11-5}{8}=\frac{6}{8}$ Đ

d) $\frac{3}{11}-\frac{2}{11}=\frac{3-2}{11-11}=\frac{1}{0}$ S