Cho tam giác ABC vuông tại A, có AB=3cm, AC=4cm, đường phân giác AD. Đường vuông góc với DC cắt AC tại E

a Chứng minh rằng tam giác ABC đồng dạng với tam giác DEC

b tính độ dài các đoạn thẳng BC,BD

c Tính độ dài AD

d Tính diện tích tam giác ABC và diện tích tứ giác ABDE

Xác định nhân vật chính, nhân vật phụ và vai trò của chúng qua các văn bản Trong lòng mẹ, Tức nước vỡ bờ Lão Hạc.

Mik cần gấp lắm các bn giúp mik nha

Bài 1 Một người đứng cách cột điện 1m cột điện cao 6m.Trên cùng là 1 bóng đèn

a Tính bóng của người đó

b Người đó đi ra xa cột điện thêm 1,5m. Tính bóng người đó

Bài2Ở giữa trần của 1 phòng có 1 bóng đèn led, ở ngay dưới đèn treo 1 lưới màu hình tròn quay được có đường kính 10cm. Tính chiều cao khi treo của lưới màu biết nhà cao 4m, diện tích sàn 16m^2, sao cho khi lưới mù quay cả sàn nhà loang loáng(trừ các góc-sàn nhà hình vuông)

Các bn giúp mik với chiều nay mik phải nộp rồi bài 1,2 các bn vẽ giúp mik hình nha

1Lan says,"My sister seldom rides a bike to school"

2They said,"Our teacher sometimes explains the diffcult lesson"

3Nam said,"I am doing my homework now"

4"Our teacher will go to Leipzig tomorrow"E mily said

5"I was writing a letter yesterday." Helen told me

6"My father flew to Dallas last year" Robert told me

7"Tim went to the standium an hour ago" Lisa said

8"My mother will celebrate her birthday next weekend" Patricia said

9"I am going to read a book this week" Michael said to me

10"We will do our best in the exams tomorrow" Jason and Victoria told me

11"We didn't eat fish two days ago" Andrew remarked

12"I spent all my pocket money on Monday" Alice said

13"John had already gone at six." David said

14"Mandy is at home" John said

15"Frank often reads a book" Max told me

16"I'm watching TV" Susan said to me

17"I am going to ride a skateboard" Richard sid to me

18"We have sleaned the windows" Stephen and Claire said

19"I didn't have time to do my homework" Richard told me

20"My mother will be 50 years old" Mrs.Jones told me

21Nam said " I am told to be at school before 7 o'clock"

Mik cần gấp, mn giúp mik nhe THANKS

1John said,"I have finished studying my lesson"

2Mary said,"I can not go to the movies with you,John"

3They said,"We have to do the assignments now"

4She said,"I went to the doctor yesterday"

5He said,"I have a toothache"

6She said,"I'II write him a prescription"

7They said,"We're going to the drugstore"

8He said,"The doctor gave me some pills"

9She said,"I go to the supermarket every day"

10He said,"I have received the envelope"

11They said,"We visited Cannery Row"

12She said,"I feel very sick"

13He said, "I bought some popcorn"

14They said,"We're flying to California"

15He said,"I'm cutting off the main valve"

16"My uncle will not plant the vegetables tomorrow afternoon", she said

17"Mr.and Mrs.Pike have just read these new spapers",Nga said

18She said,"I often listen to music at night"

19Lan's mother said,"My daughter usually brushes her teeth before meals"

Mik đang cần gấp, mn giúp mik nha THANKS

1She said,"I can't find my umbrella"

2They said,"We are learning English now"

3"My friend is coming next week",Tom said

4"I'II heldmy mum with housework this weekend"He said

5Marry said,"My father died a year ago"

6"My father is a doctor here", my friend said

7"I am going on holiday tomorrow",the boy said to his neighbor

8"You will have to finish all these exercises before next week",the teacher said to his students

9"I came back here early yesterday," she said

10"I've broken the vase," she said

11"I will never see you again," the boy said to the girl

12He said to her,"You are my friend"

13Johnny said to his mother,"I don't know how to do this exercise

14"We are waiting for the school bus", said the children

Mik cần gấp lắm, mn giúp mik nha THANKS

1 "I am waiting for john" She said

2"I don't like the idea" he said

3"The car isnt't at my house", she told me

4"We have cleaned the room", they said

5"We are worried about Peter", they told me

6"I am going to the cinema",she said

7"I saw her today", he said

8"I will see you tomorrow",he told me

9"they were here three months ago" he said

10 "We visited her this morning " they said

11 "My parents are arriving tomorrow" she said

12"I don't like this film" She said

13"Peter and Mary are getting married tomorrow"she said

14"Daisy is doing her homework" Mai said

15"I met three hours ago" Tam told me

Mik cần gấp lắm các bn giúp mik nhé THANKS