x-2x + 3x-4x + 5x-6x + ... + 99x-100x có 100 điều khoản. 
Bây giờ x-2x + 3x-4x + 5x-6x + ... + 99x-100x 
= (x-2x) + (3x-4x) + (5x-6x) + ... + (99x-100x) 
= (- x) + (- x) + (- x) + .......... + (- x) 
= -50x 
[nó 50x vì hai nhiệm kỳ làm giảm đến một. là (x-2x) = - x, ban đầu bạn có 100 điều, bây giờ 100/2 = 50] 
cho nên 
-50x = 200 
hay, x = -4

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_{^{tick nha bạn thân yêu}} Nguyễn Trần Thanh Thùy

- Tích cực là luôn cố gắng , vượt khó , kiên trì trong học tập , làm việc và rèn luyện .

- Tự giác là chủ động học tập , làm việc , không cần ai nhắc nhở , giám sát , không do áp lực bên ngoài .

Cung cấp đúng hình thức của động từ trong ngoặc

1. Oh, no! It(rain) is raining. We can't play tennis. It always (rain)rains a lot in April

2. What your son(have)does...have breakfast usually?

He usually(eat)eats a carrot and (drink)drinks a glass of cold water.

3. They( drink)are drinking some fruit at the moment.

4. She can (speak)speak English

5. Does he ( eat)eat a lot of meat?

6. My mother (give) is giving/is going to give me a new bike next week

7. He (not go)doesn't often go to the movies on sunday nights

8. Where is Mai (be) now? She (play)is playing in the garden

9. Look! she (come)is coming .

10. what there (be) (drink)is...to drink for dinner?

mẹ hơn linh là 25 tuổi 

năm 2015 mẹ số tuổi là : 

( 59 + 25) /2 = 42 ( tuổi )

mẹ sinh năm là : 

2015 - 43 = 1973 

mẹ sinh năm 1973 

tick nha 

Hello, everybody! My name is Linh. Today I am here to present to you about Favorite TV shows. I very like watching cartoons. And of all the film I have seen, “Grave of the fireflies” is one in the cartoons which I like most. In Vietnamese it’s called is “Can ham đom đom” or “Mo đom đom”. It’s a tragic story about two childents in the war. It’s made from Japan by Ghibli studio, directed and written by Takahata Isao. It is based on a nover of Nosaka Akiyuki. It’s written as a apologize to his sister. With Japanese, this film is understand as a fable about the respect. Film is been in historical background at the end of the seconds world war from Japan. Film tells a painful story but moving to brothers sentiment of two orphanages : Seita and Setsuko. They lost mother after a fierce bombing of American air force to Kobe city while their father combat for Japanese navy. So Seita and Setsuko must to struggle to exist between the famine and the resistance to merciless of surrounding people (that have their kinship). They have to live in a shelter-pit and often eat frogs and lizards. At the end, Setsuko have to die for hunger, pictures depict painfulness and the death of little girl can be considered as the most mournful film pictures in the cartoon Japan history. When everybody, who had seen this film are asked, most of them said they cried, and that have me.That brings me to the end of my presentation. Many thanks for your attention!

cho 2 cần vào thùng rồi cho thêm 1 lít nước vào

1. Be careful when you cross the road.

2. Is the a flower garden in front of your house ?

3. Thanks for this lovely present.

4. Do you get dressed before having breakfast ?

5. Near the field , there are many beautiful trees / There are many beautiful trees near the field .

6. Who is waiting for her ?

7. Who is she waiting for ?

8. In winter , the day is short and the night is long .

9. Are his sister's eyes blue ?

10. There isn't any milk left .

Chọn một đáp án đúng cho mỗi chỗ trống để hoàn thành bức thư sau.

Dear Lan,
I'm writing to invite you to a party we .......... ( have / are having / going to have / will has ) at the flat next Friday, December 14^th. As you know, .......... ( it's / its / they're / she's ) Lien's 13^th birthday next week and my birthday next month, .......... ( too / but / because / so ) we thought we'd celebrate together and have a joint party.
I can't remember if you know my address or not, but anyway, if you .......... ( to follow / follow / following / follows ) the directions below, you shouldn't get lost.
Take the Number 15 bus from the station and .......... ( get up / get by / get on / get off ) at the Star Hotel. Walk down Long Viet Road, past the Dan Chu Cinema, and then .......... ( have / get / take / bring ) the first turning on the right. That's Le Loi Road. Turn left .......... ( in / at / of / on ) the first junction, then go straight past the church as far as the next crossroads. .......... ( Right turn / To right / To turn / Turn right ) and our block of flats is the second on the right.
Do try and come. Of course you're .......... ( welcomed / welcome / welcoming / to welcome ) to bring someone with you if you want to.
Look forward .......... ( too see / for seeing / of seeing / to seeing ) you then !
Love,
Mai

Read and write

1. This person lives in the countryside where he grows food and keeps animals.

Farmer

2. If you hava a problem with your car, this person can repair it.

Mechanic

3. This person writes for a newspaper.

Journalist

4. You speak to this person when you ask for a meal in the restaurant.

Waiter

5. This person uses a camera in his work.

Photographer