Question

Tính bằng 2 cách 

( \(\dfrac{1}{3}+\dfrac{5}{1}\) ) _* \(\dfrac{1}{2}\)

(\(\dfrac{1}{3}-\dfrac{1}{5}\) ) *\(\dfrac{1}{2}\)

Answer 1

\(\left(\dfrac{1}{3}+\dfrac{5}{1}\right)\times\dfrac{1}{2}=\dfrac{16}{3}\times\dfrac{1}{2}=\dfrac{16}{6}=\dfrac{8}{3}\)

\(\left(\dfrac{1}{3}+\dfrac{5}{1}\right)\times\dfrac{1}{2}=\left(\dfrac{1}{2}\times\dfrac{1}{3}\right)+\left(\dfrac{1}{2}\times5\right)=\dfrac{1}{6}+\dfrac{5}{2}=\dfrac{8}{3}\)

câu b dựa theo làm nha bạn