Chu vi hình chữ nhật: \(\left(\dfrac{4}{5}+\dfrac{1}{2}\right)\times2=\dfrac{13}{5}\left(m\right)\)
Chu vi là \(\left(\dfrac{4}{5}+\dfrac{1}{2}\right)\times2=\dfrac{13}{10}\times2=\dfrac{13}{5}\left(m\right)\)
chu vi là:
\(\left(\dfrac{4}{5}+\dfrac{1}{2}\right)x2=\dfrac{13}{5}\left(m\right)\)