:

Bài 1, Lấy điểm A nằm trong xoy < 90 độ . gọi M là trung điểm của OA. Từ M kẻ đường thẳng vuông góc với OA cắt Õ ở B và cắt Oy ở C

A. cm : BO=BA

B. cm : CO=CA

Bài 2 : Cho tam giác Abc vuông tại A . Tính cạnh BC nếu biết :

a . AB + Ac = 17cm và AB - AC = 7cm

b. 4AB= 3AC và AB+AC = 70 cm

Bài 3 : Cho tam giác Abc , D thuộc tia đối của tia AB và E thuộc tia đối của tia AC sao cho AD = AB và AE=AC . Kẻ BH vuông góc AC và DK vuông góc  AE

a. cm tam giác ADC = tam giác ADE

b. cm : tam giác BHC = tam giác DKE suy ra góc CBH = góc EDK

xem dùm mình có chỗ nào sai ko nhé

my favorite movie is detective conan. this is my favorite movie because it makes me fell exciting when i watch it. there's high school detective named kudou shinichi . while visiting an amusement park with his chidhood fiend and classmate, mouri ran... witnessned a man in black in the midst of a suspicious transaction. while caught up inwatching the deal...he faided to potice his partner sneaking up behind him.that man foned kudou to swallow poison. and when he came.. kudo's body had shrunk.if those guys found put that koudo shinichi was still alive...they'd come after him again and put those around at hia rick......  còn nữa nhưng dài quá nhờ mọi người xem giúp nhiêu đây khi nào rãnh mình viết tiếp phần còn lại

exercise

1/he finished his work although ha was tired after the long driver

-despite......

2/although mr pike was seriously ill, he still composed nice pices of music.

-despite......

3/cars cause pollution but people still want them.

-although....

4/she wass seriously ill but she enjoyed life very much.

-although....

5/although he took a taxi, bill still arrived late for the concert.

-in spite of......

6/he had enough money.he refused to buy a new car.

-although....

-in spite of....

7/it was raining.he walked to the station.

-although....

-despite...

8/although he is got a fench name, he is in fact american.

-despite...

9/in spite of her injured foot,she managed to walk home.

-although...

10/despite the fact that we were the beter team,we lost the match.

-even though...