Đáp án + Giải thích các bước giải:
`(2n+3)^{2}-(2n-1)^{2}`
`=(2n+3+2n-1)(2n+3-2n+1)`
`=(4n+2).4`
`=8(2n+1)\vdots 8`
Vậy `(2n+3)^{2}-(2n-1)^{2}\vdots 8` ( Với `n` nguyên )
`(2n+3)^2-(2n-1)^2`
`=[(2n+3)-(2n-1)][(2n+3)+(2n-1)]`
`=(2n+3-2n+1)(2n+3+2n-1)`
`=4(4n+2)`
`=16n+8=8(2n+1)vdots8` (đpcm)
Vậy `(2n+3)^2-(2n-1)^2vdots8`.
Miêu tả bức tranh này hộ mình với.
a. Tìm hai số chẵn liên tiếp biết hiệu bình phương của hai số là 60. b. Tìm hai số lẻ tiếp biết hiệu bình phương của hai số là 96.
Giải thích đặc điểm khí hậu và thời tiết ở hai mùa của nước ta?
Tìm số nguyên a sao cho: x+7 chia hết cho x-4
giải phương trình 4x(x-3) = 3x -12
chuyên gia tiếng anh giúp em vs khi lm ghi rõ công thức đầy đủ thiếu công thức báo mod xóa ráng chịu ____________________ Ex1: cirle the best answer 17) There ( is / are) both men and women at the conference 18) The students in my class ( has / have) very good work habits 19) A notebook and a pen (is / are ) lying on the desk 20) Neither the cat nor the dogs (was /were) making the noise _____________ Ex2: cirle the best answer 1) The team (was / were ) having a shower after the match 2) Luckily, my family's restaurant ( has /have) made a record profit this year 3) Everybody in the company (was / were) very kind with Jack and me .They tried to help us whenever we asked for help 4) The held ( is/ are ) wandering all over the field 5) A swanrm of mosquitoes (was / were) attacking the group of picnickers 6) The gang (was /were) caught one by one and immediately sent to the local prison 7) The bunch of flowers (was/ were) composed of carnations, roses and daffodils 8) The staff (is / are) thinking of going on strike in an attempt to improve their working conditions 9) The congregation (was / were) all seated when the priest came in 10) The angry crowd (was / were) throwing stones at the police
Giúp em câu b, c, d thôi ạ... Pleaseeeeeeee Giải chi tiết đầy đủ các bước giúp e ạ (vẽ cả đồ thị hàm số Ox, Oy nx nhé ạ) E đag cần gấp lém
Câu 2. Số x thỏa mãn 3*.3² = 38 là : А. 4 В. 6 С. 8 D. 10.
1. She gives her children everything _________ they want. A. that B. who C. whom D. what 2. The place _________ we spent our holiday was really beautiful. A. what B. who C. where D. which 3. This is an awful film. It is the worst _________ I have never seen. A. who B. that C. what D. whom 4. The hotel _________ we stayed was not clean. A. who B. that C. where D. when 5. The last time _________ I saw her, she looked very beautiful. A. who B. that C. where D. when 6. A burglar is someone ________ breaks into a house and steals things. A. that B. which C. whom D. who 7. The reason _________ I phoned him was to invite him to a party. A. what B. whose C. why D. which 8. Is there a shop near hear _________ I can buy a postcard? A. when B. which C. where D. who 9. I gave her all the money _________ I had. A. that B. what C. when D. whose 10.The party _________ we went to wasn’t very enjoyable. A. who B. when C. that D. where 11. The stories _________ Tom tells are usually very funny. A. when B. that C. where D. who 12. Have you ever seen the photographs _________ Ann took? A. that B. where C. when D. who 13. 1945 was the year _________ the second world war ended. A. which B. why C. when D. where 14. The dress didn’t fit her, so she took it back to the shop _________ she had bought it. A. where B. which C. what D. when CÁC BẠN GIẢI CHI TIẾT HỘ MÌNH VS Ạ
So sánh 2 cách viết sau: Cách 1: A ! Con biết rồi ! không phải chè, cám mà ! Cám nấu mà bú bảo chè. Cách 2: A ! Con biết rồi ! không phải chè, cám mà ! Bu bảo cám là chè. Mọi người giúp em vs ak..Em đang cần gấp>
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