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1, để 2-x chia het cho x+ 1 thi

2-x  = 2 - ( x + 1 ) 

mà x + 1 chia het cho x+ 1 

s ra x+ 1 thuộc u của 2 

22 tháng 4 2017

dù bạn đăng nhầm nhưng mình vẫn trả lời nha !

a) f(x)- g(x)+h(x) = (x3-2x2+3x+1)-(x3+x-1)+(2x2-1)

f(x)- g(x)+h(x) = x3-2x2+3x+1- x3-x+1+2x2-1

f(x)- g(x)+h(x)= (x3-x3) +(2x2-2x2) +(3x-x)+(1+1-1)

f(x)- g(x)+h(x) = 0+0+2x+1

f(x)- g(x)+h(x) = 2x+1

b) Xét f(x)- g(x)+h(x)=0

Suy ra: 2x+1=0

2x= -1

x = - \(\dfrac{1}{2}\)

5 tháng 2 2017

Đây là Tiếng Anh mà bn ???gianroi

a) \(P\left(x\right)=2+5x^2-3x^3+4x^2-2x-x^3+6x^5\)

\(=6x^5-4x^3+9x^2-2x+2\)

b) \(P\left(1\right)=6\cdot1^5-4\cdot1^3+9\cdot1^2-2\cdot1+2\)

\(=6-4+9-2+2\)

\(=11\)

26 tháng 3 2020

1. \(f\left(x\right)=x+x^2-6x^3+3x^4+2x^2+6x-2x^4+1\)

\(\Rightarrow f\left(x\right)=7x+3x^2-6x^3+x^4+1\)

Sắp xếp theo lũy thừa giảm dần của biến x:

\(f\left(x\right)=x^4-6x^3+3x^2+7x+1\)

2. Bậc của đa thức: 4

Hệ số tự do: 1

Hệ số cao nhất: 7

3. \(f\left(-1\right)=\left(-1\right)^4-6.\left(-1\right)^3+3.\left(-1\right)^2+7.\left(-1\right)+1=4\)

\(f\left(0\right)=0^4-6.0^3+3.0^2+7.0+1=1\)

\(f\left(1\right)=1^4-6.1^3+3.1^2+7.1+1=6\)

\(f\left(-a\right)=\left(-a\right)^4-6.\left(-a\right)^3+3.\left(-a\right)^2+7.\left(-a\right)+1=3a+1\)

\(\)

5 tháng 7 2018

Thay x= 1 vào f(x), có:

f(x) = 14+2.13-2.12-6.1-5

f(x) = 1 + 2 - 2 - 6 - 5

f(x) = -10

=> x = 1 không phải là nghiệm của f(x)

Thay x = - 1 vào f(x); có:

f(x) = (-1)4+2.(-1)3-2.(-1)2-6.(-1) - 5

f(x) = 1 - 2 - 2 + 6 - 5

f(x) = -2

=> x = -1 không phải là nghiệm của f(x)

...

rùi bn lm típ nha! mk chỉ bk cách này thoy!
 

16 tháng 12 2018

Wiring

We need(1).calories...or energy to do things we(2).do...every day walking riding a bike and even sleeping!We get calories(3)..from.. the food we eat.If we eat too many we can het(4).....if we don't eat encounter we feel

Exercise 3. Chia động từ cho các câu sau đây.1. My tutor (see) ………………………… me for a tutorial every Monday at 5 p.m.2. My brother (not/study) ………………………… very hard at the moment. I (not/think) ………………………… he’ll pass his tests.3. Young people (take) ………………………… up traditional style hobbies such as knitting and walking in the countryside as of lately.4. In my country, we (drive) ………………………… on the left-hand side of the road.5. My parents (travel) ………………………… around the world this summer, and...
Đọc tiếp

Exercise 3. Chia động từ cho các câu sau đây.

1. My tutor (see) ………………………… me for a tutorial every Monday at 5 p.m.

2. My brother (not/study) ………………………… very hard at the moment. I (not/think) ………………………… he’ll pass his tests.

3. Young people (take) ………………………… up traditional style hobbies such as knitting and walking in the countryside as of lately.

4. In my country, we (drive) ………………………… on the left-hand side of the road.

5. My parents (travel) ………………………… around the world this summer, and probably won’t be back for a couple of months.

6. The number of wild butterflies (fall) ………………………… dramatically as a result of changes in farming methods.

7. More people (play) ………………………… sports on a regular basis nowadays.

8. I have never thought of studying abroad before. I (not/leave) ………………………… Vietnam anytime soon.

9. Nowadays, people (use) ………………………… the gym or a climbing wall as their way of sporting recreation.

10. The number of web users who shop online (increase) ………………………… due to the convenience of the Internet.

1
25 tháng 12 2022

1. My tutor (see) ……………sees…………… me for a tutorial every Monday at 5 p.m.

2. My brother (not/study) ………isn't studying………………… very hard at the moment. I (not/think) ……………don't think…………… he’ll pass his tests.

3. Young people (take) …………take……………… up traditional style hobbies such as knitting and walking in the countryside as of lately.

4. In my country, we (drive) …………drive……………… on the left-hand side of the road.

5. My parents (travel) …………are traveling……………… around the world this summer, and probably won’t be back for a couple of months.

6. The number of wild butterflies (fall) ……………is falling…………… dramatically as a result of changes in farming methods.

7. More people (play) …………are playing……………… sports on a regular basis nowadays.

8. I have never thought of studying abroad before. I (not/leave) …………haven't left……………… Vietnam anytime soon.

9. Nowadays, people (use) …………are using……………… the gym or a climbing wall as their way of sporting recreation.

10. The number of web users who shop online (increase) ………is increasing………………… due to the convenience of the Internet.