Vì tia Oz nằm giữa hai tia Ox và Oy nên xOy = xOz + zOy

                                                                           zOy = xOy - xOz = 180 - 70 = 110 độ

Vì góc xOm > xOz nên tia Oz nằm giữa hai tia Ox và Om nên suy ra xOm = xOz + zOm

                                                                                                                        zOm = xOm - xOz = 125 - 70 = 55 độ

Gỉa sử ta có tia Ot là tia phân giác góc zOy thì yOt = yOz/2 = 110/2 = 55 độ tức trùng với tia Om

Vậy suy ra tia Om là tia phân giác của góc yOz

1.You/Music//How to sing and play the piano

     => What do you study in music?                                                                 

      => In music , i study how to sing and play the piano                                                               

2.Lan/History//past events in Viet Nam and around the world 

       => What does Lan study in History ?
In history , she studies about past events in VN and around the world              

3.They/English//how to speak ,listen read and write in English

        => WHat do they study in English?                                                                   

          => They studies how to speak , listen,read and write in English                                                                 

4.Ba/Electronics//how to repair household appliances

         =>What does Ba studies in Electronics?                                                                

                         He studies how to repair household appliances                                                  

5.We/Computer Science// how to use a computer

          => What do you study in Computer Science ?                                                                  

             We study how to use a computer                                                               

6.Nam and Nga/Physical Education// how to keep fit

           => What do Nam and Nga study in Physical Education ?                                                            

             They study how to keep fit                                                              

Tám chia đôi bằng 8 : 2 = 4

Nữa ngang của tám là o

Còn nữa dọc của tám là 3

Dung roi ban giai ho di hihihihihiihiihihihihihiihiiihiiihiihihi

I) Tìm Từ Sai và Chữa lại:

1, Ha Noi have a population of 2.6 million.                        ...........milion.................=>...............milions............

2, Is your kitchen bigger than my kitchen?                         ..........IS.................=> .......Are....................

3, How height is the Petronas Twin Towers?                      ........height...................=>.............high...............

4, Which season is coldest in your couintry?                      ..........season is coldest.................=>.........is the coldest season..................
Hoac them ' the ' truoc coldest

II) Điền từ bị thiếu vào chỗ trống trong đoạn văn sau:

          Viet Nam is in the South- East Asia. It has (1).........lots................... of beautiful mountain, rivers and beaches. (2) .........There............... are two long (3) .........river....................... in Viet Nam: the Red River in the north and the Mekong River in the (4) ...........south.............. . The Mekong River is the (5) ......longest................... river in the South- East Asia and of course it is longer.

         (6) ..........than..................... the Red River. The Mekong River starts in Tibet and (7) ..........flows................ to the Bien Dong. Phan Xi Pang is the (8) ........X.................. highest mountain in Viet Nam. It 's 3,143 meters (9) .............high............ . Viet Nam aslo (10) ...............has........... many nice beaches such as Sam Son, Do Son, Nha Trang, Vung Tau.

Câu 1.Use the correct verb tense : Past simple or Present perfect :

which language does he speak

1. Our vacation/ start/ June/ and/ last/ three months.

.......=> Our vacation start in June and last for three months.......................................................

2. Classes/ start/ seven/ finish/ half past eleven.

......=> Classes start at seven and finish at half past eleven..............................................................................................

3. Farmers start/ work/ six/ morning.

.......=> Farmers start work at six in the morning...................................................................................................

4. People/ think/ students/ have/ easy/ life.

......=> People think these students have an easy life................................................................................................

5. We/ celebrate/ New Year/ January 1st.

........=> We celebrate New Year on January 1 st..................................................................................................

6. Vietnamese students/ have/ more/ fewer/ vacations/ American ones?

......=> Are vietnamese students have more or fewer vacations than American ones ?..................................................................................................

7. Lan/ have/ 10 hours/ homework/ every week.

.........=> Lan has 10 hours for homework every week...........................................................................................

8. There/ more/ girls/ my class/ than/ her class.

........=> There are more girls in my class than her class...........................................................................................

C=7/10x11+7/11x12+7/12x13+.................+7/69x70

C=1x7/10x11+1x7/11x12+...........+1x7/69x70

C=7(1/10x11+1/11x12+1/12x13+....+1/69x70)

C=7(1/10-1/11+1/11-1/12+1/12-1/13+.......+1/69-1/70)

C=7(1/10-1/70)

C=7(7/70-1/70)

C=7x6/70

C=3/5

Giúp tớ vài câu này nhé, cần gấp
Bài: Hoàn thành câu
1. Lan/hope/have/new bike/soon
→Lan hope will have a new bike soon
2. He/suggested/go/the cinema/to night.
→He suggested to go to the cinema tonight 
3. I/enioy/go camping/my friends/ summer vacation
→I enjoy going camping with my friends in summer vacation
4. The boys/fly/kites/the park/this time
→The boys is flying kites in the park in this time
5. You/not get/good marks/you/be/lazy
→You won't get good marks if you are lazy
6. Swim/good/your/health
→Swimming is good for your health