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TD
14 tháng 10 2019
Bài 9:
Đặt f(x) = \(2x^3+ax+b\)
Vì f(x) = \(2x^3+ax+b\) chia cho x + 1 dư 6 và chia cho x - 2 dư 21 nên ta có:
\(\hept{\begin{cases}f\left(-1\right)=2\times\left(-1\right)^3-a+b=6\\f\left(2\right)=2\times2^3+2a+b=21\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}-2-a+b=6\\16+2a+b=21\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}-a+b=8\\2a+b=5\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}-3a=3\\b=5-2a\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}a=-1\\b=7\end{cases}}\)
Vậy a = -1, b = 7
AP
0
![[âIMG]](https://lazi.vn/uploads/edu/exercise/1505311489_8.jpg)
8 tháng 8 2017
1. Would you mind if I turned on the TV?
2. Would you mind consetting this composition for me?
3. Do you mind if I take a photo of your study corner?
4. Do you mind if I give some advice on your study habit?
5. Do you mind playing the tape once more?
8 tháng 8 2017
1. Do you mind if I turn on the TV?
2. Do you mind corecting this composition for me?
3. Do you mind if I take a photo of your study corner?
4. Do you mind if I give some advice on your study habit?
5. Do you mind playing the tape once more?
6. Do you mind if I borrow your dictionary?
7. Would you mind if I had a look at your homework?
8. Would you mind telling me how you learned English at school?
9. Do you mind if I use your computer for one hours?
10. Would you mind solving this math problem for me?
8 tháng 8 2017
I,
1. You ought to study harder this semester
2. I haven't seen him since 1985
3. How long have you learnt E?
4. I haven't played soccer since 1995
5. I will go to HCM city in order to meet my friends
6. They used to live in Paris when they were young
7. We have lived here for 15 years
8. He has studied E for three years
9. Would you mind if I used your bike?
10. It's verydangerous to go swimming in the river
11. Do you mind getting me a bandage?
12. Do you mind if I turn on the television?
II,
1. took-> take
2. so as to -> so as not to
3. buyed -> bought
4. take-> took
5. wanted -> want
6. did -> do
Ngố ngây ngô là mình
Bạn giải tiếp cho mình với bạn