a) A(x) = -2x² + x⁴ - 7x + x⁴ + 7

= (x⁴ + x⁴) - 2x² - 7x + 7

= 2x⁴ - 2x² - 7x + 7

B(x) = x⁴ + 2x - 3x⁴ - 6 + 2x² - 4

= (x⁴ - 3x⁴) + 2x² + 2x + (-6 - 4)

= -2x⁴ + 2x² + 2x - 10

b) A(x) + B(x)

= (2x⁴ - 2x² - 7x + 7) + (-2x⁴ + 2x² + 2x - 10)

= 2x⁴ - 2x² - 7x + 7 - 2x⁴ + 2x² + 2x - 10

= (2x⁴ - 2x⁴) + (-2x² + 2x²) + (-7x + 2x) + (7 - 10)

= -5x - 3

A(x) - B(x) = (2x⁴ - 2x² - 7x + 7) - (-2x⁴ + 2x² + 2x - 10)

= 2x⁴ - 2x² - 7x + 7 + 2x⁴ - 2x² - 2x + 10

= (2x⁴ + 2x⁴) + (-2x² - 2x²) + (-7x - 2x) + (7 + 10)

= 4x⁴ - 4x² - 9x + 17

c) C(x) = A(x) + B(x) = -5x - 3

Cho C(x) = 0

-5x - 3 = 0

5x = -3

x = -3/5

Vậy nghiệm của đa thức C(x) là x = -3/5

d) D(x) = C(x).(2x² - 4x + 2)

= (-5x - 3)(2x² - 4x + 2)

= -5x(2x² - 4x + 2) - 3(2x² - 4x + 2)

= -10x³ + 20x² - 10x - 6x² + 12x - 6

= -10x³ + (20x² - 6x²) + (-10x + 12x) - 6

= -10x³ + 14x² + 2x - 6

giúp e gấp vs ạ=(

1. the

2. an

3. a

4. an

5. a 

6. the

7. an

8. an

9. the

10. an

1. Many people are attracted to this well-known library.

2. She isn't often helped with the housework by us.

3. Is rice and wheat grown in the North of England?

4. Where is English spoken by people?

5. You are given bad marks by the teacher.

6. English is being learned by Sam at the moment.

7. A report is being written by them now.

8. The floor is being swept by someone.

9. My favorite songs are being sung by somebody now.

10. Everything is being prepared for the presidential election by him.

11. Is an article from English being translated into Vietnamese by her?

12. A speech isn't being made by the Prime Minister at the moment.

13. Is a pond being dug in the garden by them?

14. English is being learned by them in the room.

15. Are big cakes being made for the party by her?

1. Many people are attracted by this well-known library.

2. She isn't often helped with the housework by us.

3. Is rice and wheat grown in the North of England?

4. Where is English spoken by people?

5. You are given bad marks by the teacher.

6. English is being learned by Sam at the moment.

7. A report is being written by them now.

8. The floor is being swept by somebody.

9. My favorite songs are being sung by somebody now.

10. The presidential election is being prepared by him.

11. Is an article is being translated from English to Vietnamese by her?

12. The speech isn't being made by the Prime Minister at the moment.

13. Is the pond being dug in the garden by them?

14. English is being learned by them in the room.

15. Are big cakes being made for the party by her?

Bậc của đơn thức đã cho là:

\(3+2+1=6\)

Chọn C

cnay là đa thức mà c=)))

tích cho mình nhé

?????

`#3107.101107`

Thay `x = 0` vào đa thức `P(x):`

`P(0) = 0^5 - 3*0^2 + 7*0^4 - 9*0^3 + 0^2 - 1/4 * 0`

`= 0`

`=> x = 0` là nghiệm của đa thức `P(x)`

Thay `x = 0` vào đa thức `Q(x):`

`Q(0) = 5*0^4 - 0^5 + 0^2 - 2*0^3 + 3*0^2 - 1`

`= -1`

`=> x = 0` không phải là nghiệm của đa thức `Q(x).`

Đặt M(x)=0

=>\(2x^2+3x-7=0\)(1)

\(\text{Δ}=3^2-4\cdot2\cdot\left(-7\right)=9+56=65>0\)

Do đó: Phương trình (1) có hai nghiệm phân biệt là:

\(\left\{{}\begin{matrix}x_1=\dfrac{-3-\sqrt{65}}{2\cdot2}=\dfrac{-3-\sqrt{65}}{4}\\x_2=\dfrac{-3+\sqrt{65}}{4}\end{matrix}\right.\)

\(\left(x+2\right)\left(3-2x\right)+x=2x^3-3\)

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

=>\(-2x^2+6-2x^3+3=0\)

=>\(-2x^3-2x^2+9=0\)

=>\(2x^3+2x^2-9=0\)

=>\(x\simeq1,376\)