50% nhé bạn.

Ta có:\(\frac{39}{65}=\frac{39:13}{65:13}=\frac{3}{5}\)

Vậy phân số \(\frac{39}{65}\) rút gọn được \(\frac{3}{5}\)

Fact or opinion?

Forest ecosystems are interesting than pond ecosystems. Is it fact or opinion? Why?

Please answer for me quickly! Thanks

\(\dfrac{1}{10}+\dfrac{1}{12}+\dfrac{1}{13}+\dfrac{1}{14}+...+\dfrac{1}{20}< \dfrac{1}{2}\\ \dfrac{1}{10}>\dfrac{1}{12}\\ \dfrac{1}{12}=\dfrac{1}{12}\\ ...\\ \dfrac{1}{20}< \dfrac{1}{12}\)

⇒Cộng 2 vế, ta có:

\(\dfrac{1}{10}+\dfrac{1}{12}+\dfrac{1}{14}+...+\dfrac{1}{20}< \dfrac{6}{12}=\dfrac{1}{2}\)

Vậy A<\(\dfrac{1}{2}\)

Đáp số là 9 con()