Tổng của bốn số là 260. Trung bình cộng của ba số đầu là 70. Hỏi số thứ tư là bao nhiêu ?

1/What is the source of solar energy? * photovoltaic cells sunlight solar panels electricity 2/Solar cells are used ________. * to collect energy from the sun to provide sunlight to houses to convert sunlight into electricity to collect energy from the sun and convert sunlight into electricity 3/Which of the following statements is true? * Solar cells absorb all of the light energy from the sun. The light energy causes the particles to move faster to make electricity. Solar energy can be used to power homes and businesses only. Large solar panels have been placed on cars and appliances. 4/Where have people fixed solar panels? * In the sunniest places Inside their houses On the roofs of their houses Anywhere outside their houses 5/According to the passage, all of the following statements are true EXCEPT * scientists are constantly developing new ways to capture the Sun’s energy solar energy could provide enough electricity for the whole world the Sun produces a large amount of energy. people use solar energy to reduce their energy costs.

1.trình bày những nét lớn về phong trào giải phóng dtộc ở các nước đná cuối tk XIX-đầu tk XX.Tại sao những phong trào này đều thất bại 2.chọn ra 5 sự kiện tiêu biểu nhất của ls tg cận đại và gt vì sao Mn giúp e vs ạ

Ai viết văn giúp mình với. Vote 5sao.

XI. Use the information in the card to complete the dialouge MEMEBERSHIP CARD NAME: Nguyen Huu Son AGE: 14 GRADE: 7 SCHOOl: Ngo Si Lien Secondary School HOME ADDRESS : 137 Ngo Quyen Street Foreigner: Good evening. What's your name? Son: My name is Son. Foreigner: What (1) ..............................................................................................? Son: It's Nguyen. Foreigner: How (2) ...............................................................................................? Son: I'm 14 years old. Foreigner: Good. And which (3) ...........................................................................? Son: I'm in grade 7. Foreigner: What (4) ..............................................................................................? Son: I study at Ngo Si Lien Secondary School. Foreigner: And the last question. Where (5) ........................................................? Son: 137 Ngo Quyen Street XII. Read and answer the questions : My name is Nguyen Minh Trung. I am a new student in class 7A. I am from Da Nang and my family still live there. In Ho Chi Minh cuty, I live with grandparents at 21/3B Nguyen trai street. My new school is not far from our house _ about one kilometer, so I go to chool by bike. There are a lot of students in my new school. But I don’t have any friends. I’m unhappy. I miss my parents, my sister and my friends in Da Nang. 1.What’s his full name? ………………………............................................................................ 2.Is he a new student? …………………….............................................................................. 3.Where is he from?. ……………………............................................................................... 4.Who does he live with in Ho Chi Minh city? ………………………………………………....................................... 5.What’s his address.? ………………………………………………………………………… 6.How far is it from his house to school? …………………………………………................................................ 7.How does he go to school? …………………………….................................................................... 8.Why is he unhappy? …………………………………………………………………………

Fill in the gap with one suitable word/ phrase, based on the beginning letter given. 1. English has been more and more important because it is the u............. language. 2. A.................... and dialects vary widely across the Great Britain, Ireland and nearby smaller islands. 3. She is a very competitive applicant for this job because she is b.................... She can speak English and French fluently. 4. Although he speaks English like a n................... s..................., he is actually Japanese. 5. M.................... is the language that a person has grown up speaking from early childhood. II/Complete the sentences by choosing the most suitable ending from the box and making it into a relative clause. they live next door they come from other languages it has just been published by Oxford University Press I don't like English they can learn English In the all-English environment her name is Mai 1. English has borrowed many words________________________________________ 2. There are several reasons _______________________________________________ 3. I often look up new words in the dictionary_________________________________ 4. The French couple ________________________________can get by in Vietnamese. 5. The new girl in our class________________________ is reasonably good at English. 6. Many people come to England and English-speaking countries__________________

Thế hệ trẻ vn có cần học tập Ngô tử văn hay không vì sao

Cặp quan hệ từ trong câu ghép sau đây biểu thị mối quan hệ nào giữa các vế? "Không những bạn Hồng chăm học mà bạn ấy còn rất chăm làm". đối lập. tăng tiến. giả thiết - kết quả .nguyên nhân - kết quả.

Khi em chạy nhanh và khi chạy chậm thì trường học nào lớn hơn Trên cây có 2 quả dừa có khối lượng bằng nhau, ở độ cao khác nhau. Em hãy so sánh cơ năng trong 2 trường hợp trên và cho biết cơ năng này thuộc dạng nào

Giúp mình hai bài này với ạ! Bài 1:Cho tam giác DEF có ba góc nhọn và có trực tâm là điểm H. Gọi K,M,N thứ tự là trung điểm của các đoạn thẳng HD, HE, HF. Chứng minh tam giác KMN đồng dạng với tam giác DEF với tỉ số đồng dạng k =1/2 Bài 2:Tứ giác ABCD có AB= 4cm, BC 12cm, CD = 16cm, AD = 6cm, đường chéo BD = 8cm. Chứng minh rằng: a) Tam giác ABD đồng dạng với tam giác BDC b) ABCD là hình thang Bài 6: Tứ giác ABCD có AB = 2cm, BC = 10cm; CD = 12,5cm; AD = 4cm; BD = 5cm. Chứng minh tứ giác ABCD là hình thang.