1. It is not necessary to shout.

-> You need ......................not to shout.....................

2. It is common knowledge that he has been in prison several times.

-> He is known........to have been in prison several times........

Ta có: P(x) = -3x² + x + \(\dfrac{7}{4}\)

Q(x) = -3x² + 2x − 2

P(x) - Q(x) = (-3x² + x + \(\dfrac{7}{4}\)) - (-3x² + 2x − 2)

= -3x² + x + \(\dfrac{7}{4}\) + 3x² - 2x + 2

= -x + \(\dfrac{15}{4}\)

Để P(x) - Q(x) có nghiệm thì P(x) - Q(x) = 0

-x + \(\dfrac{15}{4}\) = 0

\(\Rightarrow\) x = \(\dfrac{15}{4}\)

Vậy x = \(\dfrac{15}{4}\) là nghiệm của đa thức P(x) - Q(x).

Sắp xếp các từ thành 1 câu hoàn chỉnh:

1. family/ apartment/ find/ wants/ an/ she/ to/ for/ her.

-> She wants to find an apartment for her family.

2. interesting/ an/ film/ it/ what/ is!

-> What an interesting film it is!

3. most/ apartment/ family/ is /the /your/ suitable/ which/ for?

-> Which apartment is the most suitable for your family?

4. a/ /a/ a/ sink/ and/ bathroom/ tub/ my/ shower/ has.

-> My bathroom has a sink, a shower and a tub.

5. sick/ takes/ Lan's father/ care/ doctor/ of/ and/ a/ he/ children/ is.

-> Lan's father is a doctor and he takes care of sick children.

e) Ta có: xy + x + 2y = 5

\(\Rightarrow\) xy + x + 2y + 2 = 5 + 2

\(\Rightarrow\) x(y + 1) + 2(y + 1) = 7

\(\Rightarrow\) (x + 2)(y + 1) = 7

mà x, y \(\in\) N

Nên (x + 2) \(\in\) Ư(7); (y + 1) \(\in\) Ư(7)

Ta có bảng sau:

Vậy x = 5 ; y = 0.

c) Ta có: (3x + 1) ⋮ (2x – 1)

\(\Rightarrow\) 2(3x + 1) ⋮ (2x - 1)

\(\Rightarrow\) (6x + 2) ⋮ (2x - 1)

\(\Rightarrow\) (6x - 3 + 5) ⋮ (2x - 1)

mà (6x - 3) ⋮ (2x - 1) nên 5 ⋮ (2x - 1)

Vậy (2x - 1) \(\in\) Ư(5).

phần còn lại bn làm tương tự câu b nha :v

b) Ta có: (2x + 23) \(\in\) B(x – 1)

\(\Rightarrow\) (2x + 23) \(⋮\) (x - 1)

\(\Rightarrow\) (2x - 2 + 25) \(⋮\) (x - 1)

mà (2x - 2) \(⋮\) (x - 1) nên 25 \(⋮\) (x - 1)

Vậy (x - 1) \(\in\) Ư(25) = {\(\pm1;\pm5;\pm25\)}

\(\Rightarrow\) x \(\in\) {0; 2; -4; 6; -24; 26}

mà x \(\in\) N nên x \(\in\) {0; 2; 6; 26}

a) Ta có: (x + 22) (x + 1)

\(\Rightarrow\) (x + 1 + 21) ⋮ (x + 1)

mà (x + 1) ⋮ (x + 1) nên 21 ⋮ (x + 1)

Vậy (x + 1) \(\in\) Ư(21)

Ta có: n² + n = 56

\(\Rightarrow\) n² + n - 56 = 0

\(\Rightarrow\) n² + 8n - 7n - 56 = 0

\(\Rightarrow\) n(n + 8) - 7(n + 8) = 0

\(\Rightarrow\) (n - 7)(n + 8) = 0

\(\Rightarrow\) n = 7 hoặc n = -8

mà n là số tự nhiên nên n = 7

1. The bus pulled away as I arrived at the stop.

2. He thought I was standing too close to the edge so he pulled me back.

3.The old theatre was pulled down and replaced by a block of flats.

4. The sun was shining in my eyes so I pulled over the blinds.

5. The bank's over there. Stop and pull up behind that car. I'll get out of here.

6. He is a very popular singer at the moment. He can pull in an enormous crowd.

7. We'll make a lot of money if we can pull off this deal.

8. Come on, get dressed. Pull on a sweater and let's go.

9. It was very painful. The dentist pulled off two of my teeth.

10. We signed a contract. We can't pull out of the deal.

A ra đề giết ng` quá T.T e làm như vầy k bk có đúng hay k

Trục số:
a) Những điểm nằm cách điểm 2 ba đơn vị: -1; 5

b) Những điểm nằm giữa các điểm -3 và 4: -2; -1; 0; 1; 2; 3