P1: 

1 A new bicycle was bought by her yesterday.
2 Is your homework done every day?
3 Her car has been washed by her.
4 Will their house be built next month?
5 A letter is typed by Minh every day.

P2

1 She is known as a good teacher.

2 I was excited by the film.

3 It took us 12 minutes to wash the clothes.

\(\left(x^2-1\right)\left(x^2-2\right)...\left(x^2-224\right)=0\\ \Rightarrow\left[{}\begin{matrix}x^2-1=0\\x^2-2=0\\.....\\x^2-224=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=\pm1\left(S_1\right)\\x=\pm\sqrt{2}\left(S_2\right)\\....\\x=\pm4\sqrt{14}\left(S_{224}\right)\end{matrix}\right.\)

\(S_1=+1-1=0\\ S_2=+\sqrt{2}-\sqrt{2}=0\\ S_{224}=+4\sqrt{14}-4\sqrt{14}=0\)

\(S=S_1+S_2+...+S_{224}=0\)

Dài quá bạn tách đăng lần 5 câu thôi cho ngta còn biết đường lần:v

Cho đa giác đều 12 đỉnh. Chọn ngẫu nhiên 3 đỉnh trong 12 đỉnh của đa giá C. Xác suất để 3 đỉnh được chọn tạo thành tam giác đều là.