\(\frac{1}{3}+\frac{1}{5}x\frac{5}{7}=\frac{1}{3}+\frac{1}{7}=\frac{7}{21}+\frac{3}{21}=\frac{10}{21}\)
\(\frac{1}{3}\)+ \(\frac{1}{5}\)x \(\frac{5}{7}=\)\(\frac{10}{21}\)
\(\frac{1}{3}+\frac{1}{5}\times\frac{5}{7}\) = \(\frac{1}{3}+\frac{1}{7}\)= \(\frac{7}{21}+\frac{3}{21}\)= \(\frac{10}{21}\)
@Duy
HT