= 388

Độ dài của chim ruồi khổng lồ Nam Mỹ là:

\(5,5\cdot\left(4\dfrac{1}{8}\right)=5,5\cdot4,125=\dfrac{363}{16}\left(cm\right)\)

1 T

2 F 

3 F

1 T (give benefits to others = help others)

2 F (you do not get paid to perform community service)

3 F (Community service can help many different groups of people: street children, disabled people, even animals and the environment)

\(\sqrt5\left(x-2y\right)+3y=2\sqrt5+3x\)

=>\(\begin{cases}x-2y=2\\ 3y=3x\end{cases}\Rightarrow\begin{cases}x=y\\ y-2y=2\end{cases}\)

=>\(\begin{cases}x=y\\ -y=2\end{cases}\Rightarrow\begin{cases}y=-2\\ x=y=-2\end{cases}\)

What did you ask people to donate ?

How many volunteer programmes did they organise?

When did you start this project ?

What should people do to reduce traffic jams?

#NCD

1what did you ask people to donate ?

2How many volunteer programmes did they organise?

đề bài hỏi gì vậy bạn?

Đề hỏi j bạn???

\(M=\dfrac{2x+5}{x+1}\in Z\)

\(\Rightarrow2x+5⋮x+1\)

\(\Rightarrow2x+5-2\left(x+1\right)⋮x+1\)

\(\Rightarrow2x+5-2x-2⋮x+1\)

\(\Rightarrow3⋮x+1\)

\(\Rightarrow x+1\in U\left(3\right)=\left\{-1;1;-3;3\right\}\)

\(\Rightarrow x\in\left\{-2;0;-4;2\right\}\)

Để M là số nguyên thì \(2x+5⋮x+1\)

=>\(2x+2+3⋮x+1\)

=>\(3⋮x+1\)

=>\(x+1\in\left\{1;-1;3;-3\right\}\)

=>\(x\in\left\{0;-2;2;-4\right\}\)

\(\dfrac{4}{x}+\dfrac{2}{y}=1\) \(\left(x;y\ne0\right)\)

\(\Rightarrow2x+4y=xy\)

\(\Rightarrow2x-8+4y-xy=-8\)

\(\Rightarrow2\left(x-4\right)-y\left(x-4\right)=-8\)

\(\Rightarrow\left(x-4\right)\left(y-2\right)=8\)

\(\Rightarrow\left(x-4;y-2\right)\in U\left(8\right)=\left\{-1;1;-2;2;-4;4;-8;8\right\}\)

\(\Rightarrow\left(x;y\right)\in\left\{\left(3;-6\right);\left(5;10\right);\left(2;-2\right);\left(8;4\right);\left(-4;;1\right);\left(12;3\right)\right\}\)

Cô ấy thích hát hơn nhảy múa

She prefers singing to dancing.

Câu của bạn gần đúng, nhưng cần một chút điều chỉnh. Câu chính xác là:

Fruit is a convenient source of vitamins and energy.

Lý do:

• Bỏ "The" trước "Fruit" vì câu này không cần mạo từ xác định.
• Thay "be" bằng "is" để phù hợp với thì hiện tại đơn.
• Thêm "a" để chỉ một loại đối tượng trong nhóm.

thêm "the" sau từ is nhé bạn!

Ex. 11 :

1. take -> takes

2. never is -> is never

3. waking -> wakes

4. has been -> was

5. will go -> go

6. aren't -> isn't

7. interested on -> interested in

8. as well as -> as soon as

9. keen into -> keen on

10. is -> are

11. telling -> to tell

12. what happened -> what had happened

13. was keen about -> was keen on

14. probably will -> will probably

15. will -> will be

Ex.12 :

1. I'm keen on maths.

2. Unless you listen, you won't follow the teacher's lecture.

3. We are interested in walking in the rain

4. Should you ask me for the car, i will lend it to you.

5. John spends 30 minutes to walk to school.

6. She's fond of playing cards with her children at the weekend.

7. She's interested in taking photos of her children.

8. We don't have any time to prepare the speech.

9. I promise I will phone you next week.

10. I am fond of watching the goldfish in the tank.

11. My mon isn't passionate about preparing meals.

12. He fancies reading comic books.

13. I think not many people are into listening to music in their free time.

14. Should he studies hard, he will pass the exam.

15. If you go out in the rain, you will get wet.