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bn ơi cho mk hỏi bn lm tiếng anh hay toán mà chủ đề là tiếng anh mà bài lại là toán vậy alo????
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\(Đặt A=(n^4-3n^3+n^2-3n+1):(n^2+1) \)
\(=(n^4+n^2-3n^3+n^2-3n+10):(n^2+1)\)
\(=[n^2(n^2+1)-3n(n^2+1)+1]:(n^2+1)\)
\(=[(n^2+1)(n^2-3n)+1]:(n^2+1)\)
Để A thuộc Z thì tử phải chia hết cho mẫu mà\((n^2+1)(n^2-3n) \) chia hết cho \(n^2+1\)
=> 1 chia hết cho \(n^2+1\)
=> \(n^2+1\) thuộc Ư(1)
mà \(n^2+1>=1\) (với mọi n)
=>\(n^2+1=1\)
=>n=0
Vậy....................
\(4x^2-6x-16⋮x-3\)
\(\Leftrightarrow4x^2-12x+6x-18+2⋮x-3\)
\(\Leftrightarrow4x\left(x-3\right)+6\left(x-3\right)+2⋮x-3\)
\(\Leftrightarrow\left(x-3\right)\left(4x+6\right)+2⋮x-3\)
Mà \(\left(x-3\right)\left(4x+6\right)⋮x-3\)
\(\Rightarrow2⋮x-3\)
\(\Rightarrow x-3\inƯ\left(2\right)=\left\{\pm1;\pm2\right\}\)
làm nốt
cách 2:
Để \(4x^2-6x-16\)chia hết cho x-3
\(\Leftrightarrow2⋮x-3\)
\(\Leftrightarrow x-3\inƯ\left(2\right)=\left\{\pm1;\pm2\right\}\)
Làm nốt
I
1 went - had finished
2 had already seen
3 had already begun
4 hadn't eaten
5 asked - had come
6 sat - rested
7 watched - had done
8 went
9 did - do - was
10 have ever seen
II
1 had gone - went
2 told - had visited
3 had already started
4 went - had called
5 rang - was having
6 agreed
7 were - doing
8 had happened
9 had taught - left
10 won
1. How far is it (be) from your house to school?
2. What does she often (do)do in free time?
3. What are your leisure activities (be)?
4. At 11 pm yesterday, her sons (play) were playing computer game.
5. At present, they ( not do)are not doing anything.
6. Mai seldom (come)came back home late at night, but last night she (arrive) was arrving home at 11:30 pm.
Gạch chân dấu hiệu nhận biết của thì, xác định đặc điểm của chủ ngữ _ subject (ngôi số mấy? số nhiều hay ít?) sau đó chia động từ trong ngoặc và dịch nghĩa:
1. How far IS it (be) from your house to school?
2. What DOES she often (do)DO in free time?
3. What ARE your leisure activities (be)?
4. At 11 pm yesterday, her sons (play)WERE PLAYING computer game.
5. At present, they ( not do) AREN'T DOING anything.
6. Mai seldom (come) COMES back home late at night, but last night she (arrive)ARRIVED home at 11:30 pm.
