chứng minh a) (n+2)^2-(n-2)^2chia hết cho 8 với mọi n thuộc z b)n^2(n+1)+2n(n+_1)chia hết cho 6 với mọi n thuộc z c)n^44+6n^3+11n^2+6nchia hết cho 24 với mọi n thuộc N

vẽ 1 bé đậu mầm và 1 bé zịt cute nha hình như có x2 điểm nên tặng đ

Dùng Pascal Viết chương trình tính bình phương của 1 số và sau đó xuất bình phương từ 1 đến 20. Giúp mik vs! Hứavote 5* nek . Cho 40đ nek

Cho tam giác ABC, gọi Bx và By lần lượt là phân giác trong và ngoài của góc B. Từ A dựng AD vuông BC và AE vuông By. Gọi M,N lần lượt là trung điểm của AB và AC. C/m E,M,D,N thẳng hàng

II. Choose the word or phrase that best completes each unfinished sentence below. (2 points)1.They moved to the city _____ well-paying jobs.A. in order to getB. for gettingC. in order not to getD. so that getting2.____ is a type of bed used for carrying the sick or injured people.A. StretcherB. AmbulanceC. BandageD. Crutch3.I think I ____ home across the park.A. walkB. will walkC. am walkingD. walking4.She _____ tight to the handrail.A. heldB. caughtC. keptD. touched5.I forgot to thank them _____ helping me.A. aboutB. forC. ofD. on6.She covered her knees ______ a blanket.A. inB. underC. withD. of7.The farmers look for other work _____ get more money for their family.A. so as toB. in order thatC. so as not toD. so that8.She was _____ for days after the accident.A. consciousB. unconsciousC. consciouslyD. unconsciously9.Scale is an instrument for showing _____ people or things are.A. how heavyB. how tallC. how oldD. how high10.I tried to cheer him_____, but he just kept staring out the window.A. onB. upC. offD. outIII. Read the text and choose the best answer. (1.5 points) Accidents in the home Many thousands of children have accidents in their homes. As a result some children died. The most common accidents are with fire and hot water. Small children often touch pots of boiling water on the stove. The pots fall over and the hot water falls on the children and burns them. Some children like to play with fire. They enjoy striking matches or throwing things on a fire to make it burn brightly. If a fire gets too big, it gets out of control. Then the house catches fire. It is very dangerous to play with matches. When a child strikes a match, the flame soon burns near his fingers. Then he drops the match on the floor. Many houses catches fire in this way. Some kinds of clothing burn very easily. Many children have been badly burned because they have stood near a fire and their clothing has suddenly caught fire. Although fire and hot water cause most accidents in their home, many children cut themselves with knives. Others get an electric shock. Some children are made very ill from taking their parents’ medicine. Many small children have to go to hospital every year because they thought a box of medicine was a box of sweets. There is only one good way to see to it that accidents do not happen in the home. Do not touch anything that is dangerous. 1.What causes most accidents?A. Fire and matchesB. Fire and hot waterC. Pots of boiling water and fatD. Big fires which get out of control2.What do some children like doing?A. Touching pots of boiling waterB. Cooking on stovesC. Playing with matchesD. Catching fire3.What do children often do with lighted matches?A. Throw things on the matches to make them burn brighterB. Throw the matches on the fireC. Throw them on the floorD. Set fire to their clothes4.Why has the clothing of many children caught fire?A. The children have been too near a fire.B. Other children have set fire to the clothingC. Some children have dropped matches on their clothingD. Hot water has fallen over their clothing5.Which one of the following is the cause of many other accidents in the home?A. Playing with electricityB. Eating too many sweetsC. Sick children playing with thingsD. Playing tricks on other children6.What is the best way to see to it that accidents do not happen in the home?A. Wear clothes that do not burn easilyB. Turn off the electricity supplyC. Don’t keep knives and medicine in the houseD. Don’t touch anything that appears unsafeIV. Supply the correct form of the verbs in brackets. (3 points)1.(she/ join) in our trip next summer?2.I (not meet) her at school since last week.3.Listen. Why (the baby/ cry) ?4.We (not go) out last night because of the rain.5.(the children/ know) each other before?6.The students (not have) lessons next week.7.(you/ finish) writing the letter yet, Nam?8.What (you/do) with that ladder, Ba? - I (climb) up that tree to pick up some fruit.9.Loan (get) up very early yesterday morning to review her lessons.V. Choose the word (A, B, C, or D) that best fits each of the blank spaces. (1.5 points) How can we keep our teeth (1)______? Firstly, we ought to visit our (2)____ twice a year. Secondly, we should brush our teeth (3)____ a toothbrush and fluoride toothpaste at least twice a day, once after breakfast and once before we go to bed. We can also use toothpicks (4)_____ our teeth after a meal. Thirdly, we (5)______ eat food that is good (6)______ our teeth and our body: milk, fish, brown bread, raw vegetables, fresh fruit, etc . 1.A. healthB. healthyC. healthilyD. unhealthy2.A. dentistB. doctorC. teacherD. engineer3.A. onB. ofC. byD. with4.A. cleanB. to cleanC. cleaningD. to cleaning5.A. shouldB. ought toC. needD. A & B6.A. forB. atC. onD. to

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rút gọn A=2^100-2^99+2^98-2^97+...+2^2-2

Làm hộ mình bài 10 này nhé khó quá

Đọc đoạn trích sau và trả lời câu hỏi: “Dân ta có một lòng nồng nàn yêu nước. Đó là một truyền thống quý báu của ta. Từ xưa đến nay, mỗi khi Tổ quốc bị xâm lăng, thì tinh thần ấy lại sôi nổi, nó kết thành một làn sóng vô cùng mạnh mẽ, to lớn, nó lướt qua mọi sự nguy hiểm, khó khăn, nó nhấn chìm tất cả lũ bán nước và lũ cướp nước. Lịch sử đã có nhiều cuộc kháng chiến vĩ đại chứng tỏ tinh thần yêu nước của dân ta. Chúng ta có quyền tự hào vì những trang lịch sử vẻ vang thời đại Bà Trưng, Bà Triệu, Trần Hưng Đạo, Lê Lợi, Quang Trung,... Chúng ta phải ghi nhớ công lao của các vị anh hùng dân tộc, vì các vị ấy là tiêu biểu của một dân tộc anh hùng.” (Ngữ văn 7, Tập 2 – NXB Giáo dục) Câu 1: Từ nội dung của đoạn trích trên, viết đoạn văn ít nhất 10 dòng nêu suy nghĩ của em về truyền thống yêu nước của dân tộc ta trong tình hình dịch covid – 19 hiện nay. -Hứa vote 5 sao-

giải giúp mình phần khoanh tròn nha