Bài tập:Rút gọn

1.\(\frac{\sqrt{2}+\sqrt{3}+\sqrt{6}+\sqrt{8}+4}{\sqrt{2}+\sqrt{3}+\sqrt{4}}\)

2. \(2\sqrt{27}-6\sqrt{\frac{4}{3}}+\frac{3}{5}\sqrt{75}\)

3. \(8\sqrt{3}-2\sqrt{25\sqrt{12}}+4\sqrt{\sqrt{192}}\)

4.\(\frac{1}{2+\sqrt{3}}+\frac{\sqrt{2}}{\sqrt{6}}-\frac{2}{3+\sqrt{3}}\)

5.(\(\sqrt{12}+\sqrt{75}+\sqrt{27}\)):\(\sqrt{15}\)

6.\(\frac{1}{2}\sqrt{48}-2\sqrt{75}-\frac{\sqrt{33}}{\sqrt{11}}+5\sqrt{1\frac{1}{3}}\)

Exercise:Combine two following sentences into one

1.I was looking for a book this moring.I have found it now

\(\rightarrow\)

2.Mrs.Smith does volunteer work at the hospital.She is retired teacher

\(\rightarrow\)

3.I live in a dormitory. Its residents come from many countries

\(\rightarrow\)

4.Lake Prespa is a lonely beautiful lake.It is on the north Greek border

\(\rightarrow\)

5.The little girl ate candy the whole way.She sat next to me on the beach

\(\rightarrow\)

Bài tập: Combine two following sentences into one

1.I can't find the prints.This customer ordered them

\(\rightarrow\)I can't find...............................................................

2.Have you seen the film? Everyone is talking about it

\(\rightarrow\)Have you seen...........................................................

3.The trip sounds wonderful.You aunt has just been on it

\(\rightarrow\)The trip....................................................................

4.That young boy stole a pen.He has just left the shop

\(\rightarrow\)That young boy......................................................

5.The pen was very valuable.He stole it.

\(\rightarrow\)The pen..............................................

6.Where's the umbrella?You brought it with you

\(\rightarrow\)Where's............................................................

7.The book has been borrowred by someone.You wanted it

\(\rightarrow\)The book...........................................................................

8.My sister is studying geology.She finds it fascinating

\(\rightarrow\)My sister.................................................................

9.Van Goh cut off his ear.He was a well known writer

\(\rightarrow\)Van Goh..................................................................

10.Togo is a former French colony.It is West Africa

\(\rightarrow\)Togo............................................................................

Bài tập:Use the correct form of the verbs in parentheses:

1.If the weather.................good next weekend,we.....................away somewhere.(stay/go)

2.Come go!If we...................,we..................................the bus.(hurry/catch)

3.There................. big floods every year if the cutting down of the trees continues.(be)

4.If there.........too much litter in the streets, the environment will become polluted.(be)

5.If the sea level........................,there will be many floods in many parts of the world.(rise)

6.You would feel better if you...........................a short rest.(take)

7.If she......................two year older, she....................... part in the contest.(be/take)

8.They.....................angry if you didn't inform him.(be)

9.The teacher.........................disappointed if I.............................lazy like this.(not be/not be)

10.What...................................if the moon........................?(Happen/disappear)

Bài tập:Viết lại câu dùng IF
1.Today isn't Sunday, so the students don't go swiming
\(\rightarrow\).............................................

2.Because you don't leave immediately, I call the policeman

\(\rightarrow\) ............................................

3.I don't know her number,so I don't ring her up
\(\rightarrow\)............................................

4.Go right now or you will be late for the train
\(\rightarrow\)..............................................

5.As she is often absent from class, she can't keep pace with her classmates
\(\rightarrow\) ............................................

6.I couldn't write to Alice because I didn't know her address.
\(\rightarrow\) ..................……………
7.They heavy rain kept everybody from going outdoors
\(\rightarrow\)…………….………….……
8.I didn't watch Tv last night because I was busy
\(\rightarrow\).…….……….……………

Bài tập:Write sentences beginning with I wish

1.I haven't got much money

\(\rightarrow\)I wish................................

2.She d'like to be far away from house

\(\rightarrow\)I wish.....................................................

3.Francisco lives a long way away

\(\rightarrow\)I wish ...................................................

4.I have to practice the piano every day

\(\rightarrow\).....................................................

5.I'm very bad at math

\(\rightarrow\)I wish........................

6.Daniel doesn't live in the center of town

\(\rightarrow\)Daniel wishes........................................

7.I don't know how to repair the car

\(\rightarrow\)I wish..............................................

8.It rains here every day

\(\rightarrow\)I wish............................

9.Nicholas is sorry he smashed up his car

\(\rightarrow\)Nicholas wishes..................................

10.The snow won't until tomorrow

\(\rightarrow\)I wish...........................................

11.I am not lying on a beach in the Caribbean

\(\rightarrow\)I wish......................................................

12.I don't have time to go around the city

\(\rightarrow\)I wish....................................................

13.My friend cannot stay with me longer

\(\rightarrow\)I wish......................................................

14.I don't know many English words

\(\rightarrow\)I wish............................................

15.She doesn't send me her recent photos

\(\rightarrow\)She wishes............................................

16.It won't be fine tomorrow

\(\rightarrow\)I wish..............................

Cho 1 phân số có tử số bé hơn mẫu số là 12. Tìm phân só đó , biết rằng mẫu số gấp 3 lần tử số

Có 2 thùng dầu, trung bình mỗi thùng chứa 33 lít dầu. Số dầu ở thùng thứ hai bằng\(\frac{1}{2}\)số dầu ở thùng thứ nhất. Hỏi mỗi thùng chứa bao nhiêu lít dầu

Tìm 1 một phan số có mẫu số hơn tử số 21 đơn vị và phân số đó có thể rút gọn thành phân số 2/5

Giải theo cách lớp 4 nhé ạ