dấu "/" là dấu chia (hay phân số cũng được)
\(\frac{18}{25}\times\frac{5}{13}-\frac{1}{5}\times\frac{18}{13}\)
\(=\frac{18\times5}{25\times13}-\frac{1}{5}\times\frac{18}{13}\)
\(=\frac{18}{13}\times\frac{5}{25}-\frac{1}{5}\times\frac{18}{13}\)
\(=\frac{18}{13}\times\left(\frac{1}{5}-\frac{1}{5}\right)=\frac{18}{13}\times0=0\)
18/25x5/13-1/5x18/13
=(18x5)/(25x13)-1/5x18/13
=18/13x1/5-1/5x18/13
=18/13x(1/5-1/5)
=18/13x0=0
ht
\(\frac{18}{25}\times\frac{5}{13}-\frac{1}{5}\times\frac{18}{13}=\frac{18}{65}-\frac{18}{65}=0\)