Tập hợp {1;3;7;9} 

câu 1 : a=7 hoac a=-7 . Câu 2: x=0 . Câu 3 : +53>-48 hoac +53>+48

2.lục địa Phi là một khối cao nguyên khổng lồ cao trung bình 750m có có bồn địa xen lẫn.

- ít núi cao và đồng bằng thấp

- cao ở đông nam và thấp dần ở phía Tây Bắc.

tam giacABC vuong can nen goc CBA=45^o tam giac MBC can ma co goc MBC=15^o

^{vay goc ABM=45+15= 60 theo gia thiet} tam giac ABN deu nen goc NBA = 60^o

chung to BMN thang hang

(k lam duoc lai noi ban ay ve sai hinh )

em lop 6 tuc qua phai lam do

1 l xăng ô tô đi được số km

150:12=12,5 (km)

16l xăng ô tô đi được số km

12,5:16=200(km)

Đ/S:200km

tick cho mình

1.Bat Trang village (Gia Lam district, Hanoi), about 14km from the center, famous for pottery, brand name 500 years. To this piece of pottery, Dolly found it extremely interesting to see ordinary flowers, ceramic pots on display in every corner of the village, or exposing sun-dried leaves. Visiting the village pottery factory, Dolly also introduced a piece of produce vases, warm cups or color hunting scene. Pottery Market is the most impressive feature of Dolly, this is the focus of hundreds of halls, simulated countless other pottery, spoiled, viewed household items like bowls, ordinary, vases for the wall-hangings, wind chimes and necklaces ... or farmer-themed products, buffaloes, Thi-Pho-Chi Pho from small statues to live.

Sample letter to a friend in English - About sports № 3

Dear Paul,
Thanks for your letter. It is so nice to get news about you and your family.
As for me, I won our school tennis championship. You know I've been playing tennis for nine years. My parents bought me a terrific present - a new American tennis racket.
I cannot say that my classmates fond of sports Their likes may be divided into two groups: the boys like playing football and basketball at leisure time; however, tie girls are not keen on sport games. Some of them prefer aerobics; the others don't go in for sports at all. It's strange, isn't it?
I congratulate Jane on entering such a prestigious university.
What department has she chosen? What is she going to study? Where will she live?
Well, I must go now my mother is waiting for me.
Best wishes,
Kate

Sample letter to a friend in English - About sports № 4

Dear Bill,
I'm happy to get your letter. I wish you good luck in your championship!
In your letter you are interested in my sports preferences. I go in for football. What's more, I've been training for 8 years. Our team has taken part in many matches and we've won a lot of times. We train 4 times a week.
As for our coach, he's very strict, too. I'm sure that it's necessary to be strict when you train teenagers. He makes us do a lot of exercises but it provides excellent results!
Well, where does the championship take place? How many sportsmen are taking part? Whom are you going there with?
Sorry, I have to go now. Take care!
Best wishes,
Denis

dễ mà 

a) S = 1 - 2 + 3 - 4 + ... + 2009 - 2010

Ta chia S thành 1005 nhóm , mỗi nhóm 2 số 

S = (1 - 2) + (3 - 4) + ..........+ ( 2009 -2010)

   = -1 + (-1) + ..........+ -1

   = - ( 1 + 1 + 1 + .......+ 1)

  = - (1 x 1005)

  = - 1005

câu b cũng làm giống như trên 

đề kiểu j z vẽ hình khó quá