Kiểm tra lại đề câu c nhé bn,hình như ĐKXĐ bị sai

.

cảm ơn bn nhiều , tại lâu giờ làm pt vô tỉ toàn ra dạng tích của 2 đa thức nên quên luôn dấu ngoặc nhọn :)))))))))))))

-Ko hiểu sao bài này nghiệm đẹp mà cái máy tính cùi mía của mình ko kiểm được nghiệm :v .Máy bn dùng Shift-Solve kiểm đc nghiệm bài này thì biến đổi sẽ nhanh hơn nha

Hình 1:

Ta có \(\widehat{A_1}=\widehat{C_1}=>\)AB//CD

=> Để ABCD là hình bình hành thì AB=CD (Tứ giác có 1 cặp cạnh đối song song và bằng nhau là hình bình hành)

Hình2:

Ta có: \(OQ=ON=>O\) là trung điểm NQ

=>Để MNPQ là hình bình hành thì O là trung điểm MP hay OM=OP

(Tứ giác có 2 đường chéo cắt nhau tịa trung điểm mỗi đường là hình bình hành)

:))))))

Ex2:

1/Mr. Robert was a very good maths teacher.
⟶ Mr. Robert taught maths very well.

2.Tutoring younger children sounds very exciting.
⟶ It's exciting to tutor younger children.

3.Although Jack is not rich, he gives the beggar some money.
⟶ Jack is not rich, but he gives the beggar some money.

4.Paula knew how to cook well when she was eleven.
⟶ Paula could cook well when she was eleven.

5.It's not good to think of only yourself.
⟶ You shouldn't think of only yourself.

6.Why don't we join a programme that helps the elderly?
⟶ Let's join a programme that helps the elderly.

7.The wall has too many advertisements and graffiti.
⟶ There are too many advertisements and graffiti on the wall.

8.Shall we donate all our old books to the library?
⟶ How about donating all our old books to the library?

bữa nay anh onl nhìu nhỉ =)

1.We attended a course in communication skills a week ago.

2.They found some solutions to the housing problem of the poor.

3.We interviewed each individual member of the community.

4.What time did the volunteers come to the flooded town last night?

5.They took her into the hospital because she suddenly felt very tired.

6.Money from local businesses helped to save the nursing home from closure.

7.The farmers and the volunteers shook hands and exchanged greetings.

8.A local businessman saved the day by donating USD 20,000 to the school.