\(\frac{7}{13}\cdot\frac{5}{14}\cdot\frac{39}{15}\)
Theo đề bài ta có :
\(\Leftrightarrow\frac{7.5.39}{13.14.15}\Leftrightarrow\frac{1.1.3}{1.2.3}\Leftrightarrow\frac{3}{6}\Leftrightarrow\frac{1}{2}\)
:) :) :) :)
\(\frac{7}{13}.\frac{5}{14}.\frac{39}{15}=\frac{7.5.3.13}{13.2.7.3.5}=\frac{1}{2}\)
Bạn rút gọn là được
=7x5x39/13x14x15
=7x5x13x3/13x7x2x3x5
=13/2