$\rm 1) \\(2y-3y)^3=-y^3\\Hoặc\ đây \ là \ đề \ đúng: \\1)\\ (2x-3y)^3\\=(2x)^3-3.(2x)^2.3y+3.2x.(3y)^2-(3y)^3\\=8x^3-36x^2y+54xy^2-27y^3 \\2)(3x-2y)^3\\=(3x)^3-3.(3x)^2.2y+3.3x.(2y)^2-(2y)^3\\=27x^3-54x^2y+36xy^2-8y^3 \\\rm $
Đáp án+Giải thích các bước giải:
`1)(2y-3y)^3`
`=(-y)^3`
`=-y^3`
`2)(3x-2y)^3`
`=(3x)^3-3.(3x)^{2}.2y+3.3x.(2y)^2-(2y)^3`
`=27x^3-3.9x^2y.2+9x.4y^2-8y^3`
`=27x^3-54x^2y+36xy^2-8y^3`
V. Change these following sentences into reported speech. 1. They said: "It will be hot tomorrow." => They said (that) ....................................................................................................................................................................... 2. Mother said: "I am busy." => Mother said (that) ................................................................................................................................................................. 3. She told the police: "I have heard strange noises during the night." => She told the police (that) ................................................................................................................................................. 4. Peter said: "I go to school by train." => Peter said (that) ....................................................................................................................................................................... 5. Sandy said: "My father likes sweets." => Sandy said (that) .................................................................................................................................................................... 6. She told me: "I have been phoning with my friend for two hours." => She told me (that) .................................................................................................................................................................. Teacher: Thanh Huyen Le 0986.08.05.88 7. Peter said: "I have known the telephone number of my friend." => Peter said (that) ....................................................................................................................................................................... 8. Jim told me: "I will spend my holidays in Paris next year." => Jim told me (that) .................................................................................................................................................................. 9. Bob told me: "I went to a birthday party last night." => Bob told me (that) ................................................................................................................................................................. 10. Tom said: "I am learning for the history test." => Tom said (that) ........................................................................................................................................................................ 11. They said: "We have just returned from London." => They said (that) ....................................................................................................................................................................... 12. Mary said: "I know the answer." => Mary said (that) ...................................................................................................................................................................... 13. He said: "I read this book last month." => He said (that) ............................................................................................................................................................................ 14. Mrs White told us: "I will stay at home next weekend." => Mrs White told us (that) .................................................................................................................................................. 15. Peter and Sally said: "We live in New York." => Peter and Sally said (that) ..............................................................................................................................................
Giúp mik với lời giải chi tiết hứa đánh giá 5 sao
Phân tích đa thức thành nhân tử dùng hđt 32+8√7
vẽ lại bằng chì nhá!!!!!!!!!!!!!!!!!!!!!!!!
trong năm học , trường em hoặc lớp em đã tổ chức cho học sinh đi tham quan thực tế cảnh vật thiên nhiên. em hãy viết lại và nêu lên cảm nghĩ của em ( ngắn)
Viết bài văn nha, là trong giấc mơ đó.
Question 40. It was colder in winter last year than it is this year. A. It is colder in winter this year than it was last year. B. It is as cold in winter this year as it was last year. C. It isn’t as cold in winter this year as it was last year. D. It is cold in winter this year and last year was the same.
giữ gìn trật tự an ninh trật tự đc dùng theo nghĩa nào
tìm lỗi sai và sửa. giúp mình vs ạ
a/b-c/d , làm bằng pascal, a,b,c,d nhập từ bàn phím
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