\(\dfrac{12}{13}\times\dfrac{9}{15}+\dfrac{6}{15}\times\dfrac{12}{13}\)
\(=\dfrac{12}{13}\times\left(\dfrac{9}{15}+\dfrac{6}{15}\right)\)
\(=\dfrac{12}{13}\times1\)
\(=\dfrac{12}{13}\)
Chúc bạn học tốt
\(\left(\dfrac{12}{13}\times\dfrac{9}{15}\right)+\left(\dfrac{12}{13}+\dfrac{6}{15}\right)=\dfrac{12}{13}\times\left(\dfrac{9}{15}+\dfrac{6}{15}\right)=\dfrac{12}{13}\times\dfrac{15}{15}=\dfrac{12}{13}\times1=\dfrac{12}{13}\)mình đầu nhé