Tam giác ABC vuông tại A, Đường phân giác BD. Tính AB,AC biết rằng AD=4cm, DC=5cm

Help me , please!!!!!!!!!!!!!

EXERCISE I:Điền giới từ thích hợp vào chỗ trống:

1, Kathy is upset.....not being invited.....the party.

2, If you want to make your life worth living, make yourself useful....the country.

3, I'll have some tickets avaible....you.

4, I'm nkt ashamed....what I did. In fact, I'm proud ....it.

5, This house reminds me....the one I live.....when I was a child.

6, I wrote ....the company asking...more information about the job.

EXERCISE II: Dùng từ gợi ý viết thành câu hoàn chỉnh:

1, What/you/do/if/mother/come/home/early

2,He/may/be/sick/because/not/class/morning

3, If/ he /understand/me/I/happy/but/he/never/do

4, We/be/poor/but/if/we/rich/we/help/poor people

5, In spite/their/difficulty/they/manage/finish university

EXERCISE III: Sắp xếp từ thành câu hoàn chỉnh:

1, It/problems/that/is/solve/a/these/pity/you/can't

2,Were/party/they/quite/that/he/come/the/to/delighted/didn't

3,Mother/I/wish/my/what/tell/I/her/understood

4,They/her/understand/don't/the/much/new/like/but/teacher/they/very

5, They/good/that/morning/health/exercises/believe/is/doing/for

Exercise 1: Sắp xếp từ thành câu hoàn chỉnh:

1.to/best/how/did/Russian/I/speak/my/learn/to

2.school/they/would/play/other/rather/against/the

3.fly/sky/T/the/wish/could/in/I

4.among/the/Jack/form/is/seventh/boys/of/the

5.you/with/us/I/play/want/to

Exercise 2: Viết lại câu sao cho nghĩa không đổi:

1.We can't have lunch in the garden because it is raining

If it...................................................................................

2. They say he is a dangerous prisoner

He is........................................................

3.He can't drive so we can't go by car

If he................................................

4.We didn't know your address, so we didn't write you a letter

If we..............................................................................

5.She is very hungry now because she hasn't eaten breakfast

If she..............................................................................

6.If she had been offered the job, she would have taken it.

Unless.............................................................................

Exercise 3: Viết lại câu sao cho nghĩa không đổi:

1.The pupils had the parting party.Then they went on their summer vacation.

Before.............................................................................

2.She didn't want to hear the story again.She had heard it before.

Having heard........................................................

3."What shall we do during the Tet holidays?"The children had a talk about that question

The children discussed.........................................

4.The new principal entered the hall.Then he was presented with a big bunch of red roses

After.......................................................................

5.Don't read in bad light. Your eyes will be ruined

If...........................................

6. The child was so excited. He couldn't help laughing cheerfully

...........................so.....................that...............

7.She couldn't hear anything.It was very outside.

.............too...........noisy................

8. "Try to get up early.Try to do morning exercises to keep you strong and healthy."

He advised me ......................................................................

Exercise 4: Dùng từ gợi ý viết thành câu hoàn chỉnh:

1.Earnest Hemingway/born/Illinoise 1899/die/Idaho/1961

2.Father/doctor/mother/musician and painter.

3.He/work/ambulance driver/Italy/First World War.

4.After war/he/be/journalist/in Paris/several years.

5.He /write/many well-known novels/including "For Whom The Bell Jolls" and" The Old Man and The sea"

6.He /win/Nobels prize for Literature/11954

11,2 l hoonx hợp khí X gồm H₂ và Ch₄ có tỉ khối so với O₂ là 0,325. Đốt hỗn hợp khí X với 28,8g O₂,sau phản ứng làm lạnh để hơi nước ngưng tụ được hỗn hợp Y.

a, Tính % theo thể tích của hỗn hợp khí X.

b, Tính % theo thể tích và theo khối lượng của hỗn hợp khí Y.

Hỗn hợp khí X gồm C₂H_4, CH_4, C₃H_4. Đốt cháy hoàn toàn V lít hỗn hợp X trong O₂ thu được CO₂ và 12,6g H₂O.

a, Viết các phương trình phản ứng xảy ra

b, Tính V?

Đốt cháy hoàn toàn 22,4 g Fe trong O2 sau phản ứng thu được 32g 10 oxit sắt.Xác định công thức của oxit sắt?