chx có ok

3,5 = \(\frac{6}{10}\)

Vậy ta có phép tính 2/3 x 6/10

Chỗ này dễ quá và quen thuộc, bạn tự giải đi nha!

Nhớ tích nhớ!

1. He works the most effectively in my company

-> No one in my company works as effectively as him.

2. We didn't go to the theatre. We had a lot of work to do                                                                                           

-> Because we had a lot of work to do, we didn't go to the theater. 

3. You’ll hurt yourself if you aren’t careful.                                                                                                               

-> Unless you are careful, you will hurt yourself.

4. Many people have visited the exhibition                                                                                        

-> The exhibition has been visited by many people.

5. John began playing the piano ten years ago                                                                                                

-> John hasn’t played the piano for 10 years.

6. The man can't find the stolen car

-> The stolen car can't be found.

7. They have invented a new kind of medicine

-> A new kind of medicine has been invented.

8. Man will solve the problem of pollution in the future

-> The problem of pollution will be solved in the future by man.

9. Your son paid less attention to his study, didn’t he?

-> Did your son pay less attention to his study.

10. Living in the city is more convenient than living in the country

-> Living in the country isn’t as convenient as living in the country.

\(-\frac{625}{256}\)nha

\(\frac{-5^4}{4^4}\)=\(\frac{-625}{256}\)

A D B C a b 1 1 1 M N 1 1 c 2 2 2

a) Ta có \(\widehat{B_1}+\widehat{ABC}=180^o\)( 2 góc kề bù )

\(\Rightarrow70^o+\widehat{ABC}=180^o\)\(\Leftrightarrow\widehat{ABC}=110^o\)mà \(\widehat{C_1}=110^o\)

\(\Rightarrow\widehat{ABC}=\widehat{C_1}\)mà \(\widehat{ABC}\text{ và }\widehat{C_1}\)là 2 góc đồng vị

=> a // b

b) Vì \(\hept{\begin{cases}a//b\left(\text{ phần a}\right)\\c⊥b\end{cases}}\Rightarrow c⊥a\Rightarrow\widehat{A_1}=90^o\)

c) Ta có : \(\widehat{B_1}=\widehat{C_2}\)( 2 góc so le trong )\(\Rightarrow\widehat{C_2}=70^o\)

Lại có tia phân giác của \(\widehat{ABC}\)tạo ra \(\widehat{B_2}=\frac{\widehat{ABC}}{2}=\frac{110^o}{2}=55^o\)

Mà \(\widehat{N_2}\)là góc ngoài của ∆NBC \(\Rightarrow\widehat{N_2}=\widehat{B_2}+\widehat{C_2}=70^o+55^o=125^o\)

Lại có : \(\hept{\begin{cases}\widehat{N_1}+\widehat{N_2}=180^o\left(\text{2 góc kề bù }\right)\\\widehat{N_2}=\widehat{D_2}+\widehat{M_1}\left(\text{do }\widehat{N_2}\text{ là góc ngoài của }∆DMN\right)\end{cases}}\)

\(\Rightarrow\hept{\begin{cases}\widehat{N_1}+125^o=180^o\\\widehat{M_1}=\widehat{N_2}-\widehat{D_2}\end{cases}}\)\(\Rightarrow\hept{\begin{cases}\widehat{N_1}=180^o-125^o\\\widehat{M_1}=125^o-90^o\end{cases}}\)\(\Rightarrow\hept{\begin{cases}\widehat{N_1}=55^o\\\widehat{M_1}=35^o\end{cases}}\)

@ln2a2_lemanhhung

cop bài thì đọc cho kĩ đề vô nhé bạn