1 D

2 A

3 C

4 B

5 B

=(2,75-2,25)-0.6=0,5-0,6=-0,1

1 năm không nhuận bằng 365 ngày nha bạn

1 năm không nhuận bằng 365 ngày, em nhé.

• It's good for us to go to bed early every day.
  ➝ We should go to bed early every day.
• His lunch doesn't have any fruit or vegetables.
  ➝ There isn't any fruit or vegetables in his lunch.
• Lucy hasn't exercised for three months.
  ➝ Lucy last exercised three months ago.
• Dave eats lots of sweets, so he is becoming fat.
  ➝ Because Dave eats lots of sweets, he is becoming fat.
• Sitting close to the TV screen is not good for you.
  ➝ You should not sit close to the TV screen.
• Let's do something outdoors this afternoon.
  ➝ How about doing something outdoors this afternoon?
• Natalie isn't interested in sleeping in at the weekend.
  ➝ Natalie doesn't like sleeping in at the weekend.
• Although Kelvin likes fast food, he doesn't usually eat it.
  ➝ Kelvin likes fast food but he doesn't usually eat it.
• Nhớ tick cho mik nha.

1. It's good for us to go to bed early every day.

We should ..........go to bed early every day.................................................................

2. His lunch doesn't have any fruit or vegetables.

There isn't any .....fruit or vegetables in his lunch...........................................................

3. Lucy hasn't exercised for three months

Lucy last exercised............three months........................................

4. Dave eats lots of sweets, so he is becoming fat.

Because Dave .........eats lots of sweets, he is becoming fat............................................................

5. Sitting close to the TV screen is not good for you.

You should ..........not sit close to the TV screen......................................................................

6. Let's do something outdoors this afternoon

How about .......doing something outdoors this afternoon............................................................... ?

7. Natalie isn't interested in sleeping in at the weekend.

Natalie doesn't like ..........sleeping in at the weekend.......................................................

8. Although Kelvin likes fast food, he doesn't usually eat it.

Kelvin likes ......fast food, but he doesn't usually eat it...................................................................................

1. energy

2. ride

3. calories

4. spend

5. for

6. fit

7. from

8. in

9. exercise

10. tired

1 energy

2 ride

3 calories

4 spend

5 for

6 fit

7 from

8 in

9 exercise

10 tired

Olm chào em, cảm ơn đánh giá của em về chất lượng bài giảng của Olm, cảm ơn em đã đồng hành cùng Olm trên hành trình tri thức. Chúc em học tập hiệu quả và vui vẻ cùng Olm em nhé!

dễ hiểu thật

Ta có: \(10^6-5^7\)

\(=\left(2\cdot5\right)^6-5^7\)

\(=2^6\cdot5^6-5^6\cdot5\)

\(=5^6\left(2^6-5\right)=5^6\cdot\left(64-5\right)=5^6\cdot59\) ⋮59

chia hết cho 59

10^6 - 5^7 chia hết cho 59

\(\left(x-3\right)^2+6-2x\)

\(=x^2-6x+9+6-2x\)

\(=x^2-8x+14\)

\(\triangle=\left(-8\right)^2-4\cdot1\cdot14=8\)

\(x_1=\frac{8-\sqrt8}{2\cdot1}=4-\sqrt2\)

\(x_1=\frac{8+\sqrt8}{2\cdot1}=4+\sqrt2\)

kết luận: \(x_1=4-\sqrt2;x_2=4+\sqrt2\)

\(7^6+7^5-7^4=7^4\left(7^2+5-1\right)=7^4.55\)

ta áp dụng tính chất chia hết cho 1 tích:

\(55\vdots11\) ⇒ \(7^4.55\vdots11\)

⇒ \(7^6+7^5-7^4\vdots11\)

7^4*7^2+7^4*7-7^4

=7^4*(49+7-1)

=7^4*55

Điều phải chứng minh