1, Cho hình thang ABCD (AB // CD) có AB < CD, AD = BC = AB, \(\widehat{BDC}\) = 30 độ. Tính các góc của hình thang.
2, Cho hình thang ABCD ( AB // CD). Hai đường phân giác của góc A và B cắt nhau tại điểm K thuộc đáy CD. Chứng minh AD+ BC = DC.
3, Cho hình thang ABCD ( AB//CD)
a, Chứng minh rằng nếu hai tia phân giác của 2 góc A và D cùng đi qua trung điểm F của cạnh bên BC thì cạnh bên AD bằng tổng hai đáy.
b, Chứng minh rằng nếu AD = AB + CD thì hai tia phân giác của hai góc A và D cắt nhau tại trung điểm của cạnh bên BC.
4, Cho hình thang ABCD có \(\widehat{A}\) = \(\widehat{B}\) = 90 độ và BC = AB = \(\dfrac{AD}{2}\) . Lấy điểm M thuộc đáy nhỏ BC . Kẻ Mx \(\perp\) MA , Mx cắt CD tại N. Chứng minh rằng tam giác AMN vuông cân.
Viết lại câu :
1, " I don't usderstand what you are saying"
-> Tom said.............................................................................
2, " They usually wore Jeans when they were young "
-> They used to ...................................................................
3, Nhung will be 18 years old next week .
-> It's Nhung .......................................................................
4, I would like you to help me to put the chairs away
-> Do you mind ..........................................................................
5, " Please don't make any noisy"
-> My father asked ...................................................................
6, Having a vacation abroad is very interesting
-> It's ..........................................................................................
7, Let's meet inside the centre at the coffee bar
-> How about .............................................................................
8, That water was so cold that the children couldn't swim in it
-> The water was not ................................................................
9, " Please send an ambulance to Quang Trung school "
-> Lan said to the murse .............................................................
10, We are willing to drive you to the airport
-> ...........................................................................................
11, " Don't touch anything in this room "
-> The policeman asked ................................................................
12, They are good teacher at Maths
-> They teach ............................................................................
13, " Don't worry about them"
-> Her mother said ...................................................................
14, " Don't drive too fast"
-> Nam's mother advised him ..........................................................
1,Thay đổi các câu sau từ trực tiếp sang tường thuật :
a, " Show me your driving licence, please" .The policeman said.
b, " Don't swim out too far". The lifegward said.
c, " You should drink alcohol or smoke".The doctor advised.
d, " You shouldn't stay up late". The doctor advised.
e, " Hurry up" .I said to Tim.
f, " Don't leave the door open". He said to me.
g, " Turn left at the first traffic light". Nam said to the taxi driver.
h, " Don't make so much noise". My mother said to me.
2, Chia động từ :
a, When I (be) small. Our family (live) in the countryside.
b, Miss Trang is in hospital.
Yes, I know . I (visit) her tomorrow.
c, I (read) an interesting book at the monment.
d, Look at thoes black clouds . It (rain).
e, I (not invite) her to the party because I (forget) her phone number.
f, Look ! Out new teach (come). She (have) long, black hair.
g, A friend of mine (call) me last night.
h, My father (read) a book now.
i, He used to ( smoke ) alot.
j, Nam (not use) to play badminton.