Ta có :
$a^3-b^3+c^3+3abc$
$=(a-b)^3+3ab.(a-b)+c^3+3abc$
$=[(a-b)^3+c^3]+3ab.(a-b+c) $
$=(a-b+c).[(a-b)^2-(a-b).c+c^2]+3ab.(a-b+c)$
$=(a-b+c).(a^2+b^2+c^2-2ab-ac+bc+3ab) $
$=(a-b+c).(a^2+b^2+c^2+ab+bc-ac)$
They will buy a new apartment near the airport next year.--> A new apartment __________________________________ My mother bought a new bike for me last month.--> A new bike __________
Exercise 3: Choose the correct article in brackets to fill in the blanks. The bundle of sticks Once upon a time, there was (1) _____ (a/ the) woman who had six sons. The six boys were always fighting. This made it difficult for the mother to do any work. (2) _____ (The/ A) woman decided to teach her sons (3) _____ (a/ the) lesson. She got six sticks and tied them together into (4) _____ (a/ an) bundle. She asked each boy to break (5) _____ (the/ a) bundle of sticks. All (6) _____ (the/ a) boys tried very hard to break it but they could not. Then, their mother untied the bundle and gave each boy (7) _____ (a/ the) stick. She asked them to break (8) _____ (the/ an) stick. This was easy! The sons understood that it was better to work together. They entered (9) _____ (a/ the) competition to build a house. They won (10) _____ (a/ the) competition because they had all worked together. Exercise 4: Choose the correct quantifier in brackets to fill in the blanks. The goose that laid golden eggs Once upon a time, there was a lazy farmer. He did not like doing (1) _____ (too many/ too much) work so he sold his animals to get money. Soon, there were (2) _____ (not many/ not much) animals left, but only one – a goose. The goose laid only one egg every day and the farmer sold it. But the farmer had (3) _____ (too much/ too many) problems and needed more money. One day, the goose laid a golden egg. The farmer sold this egg for a lot of money. The goose laid a golden egg every day. The farmer was very happy because it was (4) _____ (not many/ not much) work to sell one egg a day and he became rich. But he became greedy. He though I can never have (5) _____ (too money/ too much) money! He wanted more golden eggs. He fed the goose (6) _____ (too many/ too much) food but it still laid only one egg a day. The farmer became angry. The goose was taking (7) _____ (too much/ too many) time. The farmer cut open the goose to take out the eggs but there were no eggs inside it. Of course, this caused (8) _____ (too many/ too much) pain to the goose. The goose died. The farmer became poor again because of (9) _____ (too much/ too many) greed. (10) _____ (Not many/ Not much) people are as cruel and greedy as him. Exercise 5: Choose the correct adjective in brackets to fill in the blanks. Greece Greece is a country in Europe. Its capital city is Athens, which is a very (1) _____ (beautiful/ beauty) city with many very (2) _____ (elder/ old) monuments. One very (3) _____ (fame/ famous) monument is the Acropolis. There are lots of islands in Greece and it also has a very (4) _____ (long/ length) coastline. Many tourists go to Greece on holiday to enjoy the warm (5) _____ (blue/ yellow) sea, and to et the (6) _____ (taste/ tasty) Greek food. Greeks eat a lot of (7) _____ (freshly/ fresh) fish and vegetables. Greek houses are usually (8) _____ (white/ whiter) and have (9) _____ (flat/ flatly) roofs. People can use these roofs to dry fruit in the (10) _____ (hot/ hottest) summer and collect rainwater in the winter. Exercise 6: Fill in the blanks with the correct subject pronoun in brackets. My Aunt Betty My Aunt Betty is a teacher. (1) _____ (She/ He) works in a small primary school near my house. In her class, there are thirty-five children. (2) _____ (It/ They) all work very hard at school. One day, I was walking with my aunt when (3) _____ (we/ he) met some children from her class. She greeted them and they waved to me. “Hello,” (4) _____ (it/ they) said to me. “(5) _____ (We/ She) are in your aunt’s class at school. She is a very good teacher and we all like her very much. (6) _____ (He/ You) are lucky she is your aunt.” “Thank you,” (7) _____ (he/ I) said. “Yes, I think (8) _____ (she/ I) am lucky too. (9) _____ (You/ She) is a very good aunt.” “And I am very lucky to have you,” added my aunt, smiling at me. And (10) _____ (we/ it) all laughed.
Giúp mình 1 câu này nhé ^^ Tính giá trị góc tới $i_{gh}$ phản xạ toàn phần trong trường hợp ánh sáng đi từ: a- Nước có chiết suất 4/3 sang không khí. (0,5 điểm) b- Thủy tinh có chiết suất 3/2 sang nước có chiết suất 1,333. $i_{gh}$
Giải hộ mk gấp Hứa vote 5 sao và cảm ơn
Vì sao nhà Nguyễn lại hạn chế buôn bán với phương nhân phương Tây?
tìm giá trị lớn nhất , giá trị nhỏ nhất của biểu thức -{x-2}^4-|y-1|+1
ai trả lời được mình cho 5 sao Đọc đoạn trích sau và trả lời câu hỏi. Dưới bóng tre xanh, đã từ lâu đời, người dân cày Việt Nam dựng nhà, dựng cửa, vỡ ruộng, khai hoang. Tre ăn ở với người, đời đời, kiếp kiếp. [...] Tre với người như thế đã mấy nghìn năm. Một thế kỉ "văn minh", "khai hóa" của thực dân cũng không làm ra được một tấc sắt. Tre vẫn phải còn vất vả mãi với người. Cối xay tre nặng nề quay, từ nghìn đời nay, xay nắm thóc. Câu 1:Hãy xác định trạng ngữ trong mỗi câu trên? Câu 2:Các trạng ngữ vừa tìm được bổ sung cho câu những nội dung gì? Câu 3: Có thể chuyển các trạng ngữ nói trên sang những vị trí nào trong câu? Câu 4: Trạng ngữ có những đặc điểm nào? *Đọc phần 1 SGK/45 và trả lời các câu hỏi sau:
All of the scientific (A) evidence point (B) to the conclusion that increasing (C) use of pesticides in farming is damaging (D) our health. tìm lỗi sai và sửa lại
Bài 2: Cho tam giác vuông ABC, góc A=90, góc C= 30 và đường phân giác BD (D thuộc cạnh AC) a) Tính tỉ số AD/CD b) Cho biết độ dài AB = 12,5cm, hãy tính chu vi và diện tích của tam giác ABC
Nêu các tác nhân gây hại cho hệ bài tiết nước tiểu ? các thói quen sống khoa học để bảo vệ hệ bài tiết nước tiểu là gì?
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