11/15-7/15+3/5
=11/15-7/15+9/15
=13/15
k như đã hứa nha
\(\frac{11}{15}-\frac{7}{15}+\frac{3}{5}\)
\(=\frac{4}{15}+\frac{3}{5}\)
\(=\frac{4}{15}+\frac{9}{15}\)
\(=\frac{13}{15}\)
\(\frac{11}{15}-\frac{7}{15}+\frac{3}{5}\)
\(=\frac{11}{15}-\frac{7}{15}+\frac{9}{15}\)
\(=\frac{11-7+9}{15}\)
\(=\frac{13}{15}\)
\(#Cothanhkhe\)