Diện tích hình vuông ABCD là :

A.  9 c m 2

B.  12  c m 2

C.  6  c m 2

D. 27  c m 2

Chữ số 8 trong số 36,082 thuộc hàng nào?

A. Hàng đơn vị

B. Hàng phần mười

C. Hàng phần trăm

D. Hàng phần nghìn

|-10| - (-25) + |-25|

= 10 + 25 + 25 = 60

rewrite each sentence beginning as shown so that the meaning stays the same

1. English is my favorite subject

⇒ I like English best.

2. David plays for his school volleyball team

⇒ David is a member of his school volleyball team.

84+x=-80

x=-80-84

x=-164

số nguyên tố nhỏ nhất là số 2

Gọi số phải tìm là \(\overline{ab}\) (a, b \(\in\) N; a, b \(\ge\) 0)

Theo bài ra ta có:

\(\overline{ab}=8\left(a+b\right)\)

\(\Rightarrow10a+b=8a+8b\)

\(\Rightarrow10a-8a=8b-b\)

\(\Rightarrow2a=7b\)

\(\Rightarrow\dfrac{a}{7}=\dfrac{b}{2}\)

Áp dụng tính chất của dãy tỉ số bằng nhau ta có:

\(\dfrac{a}{7}=\dfrac{b}{2}=\dfrac{a-b}{7-2}=\dfrac{5}{5}=1\)

\(\Rightarrow a=1.7=7\)

\(\Rightarrow b=2.1=2\)

=> Số phải tìm là 72

Vậy số phải tìm là 72

1. I decided ( change ) ....to change.... my mind

2. I hope ( meet ) ...to meet.... you tomorrow morning

3. He tried ( give ) ...to give....... up smoking

4. I learned ( drive ) .....to drive......... when I was a little boy

5. He promised ( accept ) .....to accept..... my application

6. I refused ( buy ) .......to buy..... the second hand car

7. I often ( give ) ...give... you a chance

8. I will remember ( send ) .....to send...... the letter to her

9. I don't know how ( translate ) ........to translate...... the sentence into Vietnamese

10. Don't hesitate ( call )......to call....... me when you need my help

\(S=\left(-3\right)^0+\left(-3\right)^1+\left(-3\right)^2+...+\left(-3\right)^{2004}\)

\(\left(-3\right)S=\left(-3\right)^1+\left(-3\right)^2+\left(-3\right)^3+...+\left(-3\right)^{2005}\)

\(\left(-3\right)S-S=\left[\left(-3\right)^1+\left(-3\right)^2+\left(-3\right)^3+...+\left(-3\right)^{2005}\right]-\left[\left(-3\right)^0+\left(-3\right)^1+\left(-3\right)^2+...+\left(-3\right)^{2004}\right]\)\(\left(-2\right)S=\left(-3\right)^{2005}-\left(-3\right)^0\)

\(S=\dfrac{\left(-3\right)^{2005}-1}{-2}\)

I . put the verbs in the brackets into the correct form , to infinitive or verb - ing

1. My sister is learning ( drive ) ...to drive..... a car

2. Nga suggested ( play ) ...playing...... a game called 20 questions

3. My uncle decided ( sell ) .....to sell...... his old house

4. It is a difficult math problem . I have to spend two hours ( solve ) .....solving.... it

5. When I have free time I enjoy ( listen ) ....listening.... to music

6. Would you like ( come ) ......to come........ for dinner with my family ?

7. The children stopped ( talk ) .....talking........ when the teacher came

8. Don't forget ( turn ) ....to turn....... off the lights when you got out

9. Can you help ( do ) .....to do..... the washing up ? I hate ( do ) .....doing..... the washing up

10. I hope ( finish ) ....to finish..... my homework in a few minutes