Draw a picture of animals or the things around you. Write a few sentences to describe your picture. Think of the following before you start painting.

Tìm m để hệ có nghiệm:

\(\begin{cases} x^2 + y^2 = m +1\\ x^2 + y^2 + 2x + 4y +1 = 0\end{cases}\)

Yêu thương là gì