Bài 1:cho hình thoi ABCD có góc B =60 . kẻ AE vuông góc DC,AF vuông góc BC.

a. CM AE=AF

b. CM tam giác AEF đều

c. Biết BD =16cm. Tính chu vi tam giác AEF

Bài 2:

Cho hình thoi ABCD có góc A =60. Vẽ BH vuông góc AD rồi kéo dài 1 đoạn HE =HB

a.CM ABDE là hình thoi

b.3 điểm E,D,C thẳng hàng

c. Cm EB=AC

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Mình cần gấp .cảm ơn

Choose the best option to complete each sentence. Circle A, B, C, or D.
1.Which is ___________, flying a kite or riding a cart?
A. interesting B. more interesting C. most interesting D.best
2.This is the ___________ paddy field I’ve ever seen.
A. bigger B. bigest C. biggest D. big
3.Loading the rice is ___________ than I expected.
A. easier B. much difficult C. easily D. more easily
4.A big city is ___________ populated than a village.
A. densely B. more densely C. most densely D. the most densely
5.So many people nowadays are__________computers and mobile phones.They use them a
lot.
A. addicted to B. bored with C. worried about D.afraid of
6. ________can make you relaxed. You enjoy them in your free time.
A. Sports B. Riding a horse C. Leisure activities D. Flying a kite
7. A tent can be _________pulled down and transported than a ger.
A. most easily B. easier C. more easily D. as easily
8. When summer comes, we enjoy________blackberries.
A. riding B. picking C. herding D.putting up
9.Sitting in front of the computer for too long may lead to ___________.
A. obesity B. eye-tiredness C. backache D.all of them
10.Spending too much time in the ___________ world may negatively affect your life.
A. real B. present C. virtual D. past
11.Do you enjoy ___________ crafts?
A. making B. make C. make D. made
12.My younger sister fancies ___________ pictures every weekend.
A. to take B. taking C. took D.takes
13. If you have to do home improvements,_________is a good way to save money.
A. doing DIY B. eating out C. making crafts D.reading
14. When you do team sports such as_________you team spirit too.
A. staying outdoors B. watching TV C.walking D.playing football
15. I detest ___________so early in the morning.
A. getting up B. get up C. to get up D.got up
16. Joan doesn’t mind ___________ football but she doesn’t want to play it.
A. watch B. watches C. watching D.to watch
17. The nomads move two or three times a year to look for new ________for their cattle.
A. land B. houses C.products D. pastures
18. I love________with my best friend Susan during the weekend. We go window-shopping
or to the cinema.
A. chatting B.hanging out C. visiting D. studying
19. Why don’t you apply for this job? It is right ______ your street.
A. on B. up C. in D. at
20. The boys often help their parents to ______ water from the river.
A. herd B. ride C. pick D. collect

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Mình cần gấp.Cảm ơn mn

Cho tam giác nhọn ABC. Gọi H là trực tâm của tam giác ,M là trung điểm của BC. Gọi D là trung điểm đối xứng 
của H qua M.

a. CM tứ giác BHCD là hình bình hành 

b. CM tam giác ABD vuông

c. gọi I là Trung điểm cùa AD. CM rằng IA=IB=IC=ID

Phân tích đa thức thành nhân tử:

a)a^2+a^2y-7x-7y

b)4x^2-9y^2+4x-6y

c)x^2-2x+2y-7^2

d)4x^4+81

e)x^7+x^2+1

f)x^7+x^5+1

em cần gấp ạ 

Cho tam giác ABC biết BC=12cm.Gọi M,N lần lượt là trung điểm các cạnh AB,AC 

a)CM:tứ giác BCNM là hình thang

b)Tính đọ dài đọa thẳng MN

cho hình thang ABCD(AB//CD),biết góc D=60.Tính góc A,góc B,góc C