Chiều dài của mảnh đất hình chữ nhật là;

30+16;2=23 cm bạn ơi máy mình ko thể viết dấu ngoặc dấu ngoặc ở 30+16 nhé

Chiều rộng HCN là

30-23=7

Diện tích hình chữ nhật là 

7.23=161 bạn nhé dấu chấm là nhân nha

\(x+10=20+63\)

\(x+10=83\)

           \(x=83-10\)

           \(x=73\)

1. Alaska is perhaps the most (puzzling/ festive/ amazing) state in the USA. It has over three million lakes.

2. The old tradition of first- footing is still practiced today in (Scottish/ Scots/ Scotland).

3. In Canada, the serving of coffee at the end of an evening is a signal that it is time for (visitors/ tourists/ holiday makers) to leave.

4. The Maori in New Zealand greet each other by (punching/ touching/ blowing) their noses.

5. Australia is composed of seven (nations/ countries/states)

6. There is a red maple leaf on the (flag/ banner/ money) of Canada.

7. If the factory (continues/ to continue/ continued) dumping poison into the lake, all the fish and other aquatic animals will die

9. Water (pollution/ pollute/ polluted) in the lake has made the fish die.

10. Mi and Nick like (comes/ come/ coming) back Mi’s home village on holiday.

11. If the factory continues dumping poison into the lake, all the fish and other aquatic animals (will die/ to die/ dead)

12.Water pollution is the (contaminating/ contaminate/ contamination) in the lake has made the fish die.

13. If we (will use/ would use/ use) water carefully, more people will have fresh water.

14. If the factory continues dumping poison (into/ to/ about) the lake, all the fish and other aquatic animals will die.

x + 1 = 100 - 99

x + 1 = 1

      x = 1 - 1

      x = 0

1. in

2. before

3. between

4. on

5. out

6. for

7. up

8. at

9. at

10. for

1. How long is it since they first used this kind of energy-saving bulb. 2. He wishes he could do the English test well. 3. If I were you, I should ride my bike carefully. 4. Their father looks after their children well. 5. My brother is a skillful volleyball player. 6. I haven't used that bike since 2015. 7. Nobody in this company works as carefully as them. 8. I suggest showers should reduce the amount of water we use. 9. She said that she wanted to send her son to a university in Australia. 10. Passover is celebrated in Israel in late March or early April.

1. You can't improve your English if you don't practice more. 2. My student was offered an opportunity to study abroad. 3. Because my friend doesn't study hard, she can't pass the exam. 4. She asked him how many people there are in his family. 5. My son finds it interesting to speak English with foreigners. 6. Lan wishes that she had time to prepare for her test better. 7. Nam asked me if my grandparents still lived in Nha Trang then. 8. I have never gone on a picnic before. 9. David said that his mother would celebrate her birthday the following weekend. 10. I like that shirt more than this shirt.

1. complaints 2.entertaining 3. disappointingly 4. attractively 5. regularly 6. relaxation 7. strictly 8. drop 9. worrily 10. enhance 11. feeling 12. store 13. covered 14. Viewers 15. criers

2. probably 3. culture 4. leaders 5. charitable 6. efficiently 7. pollute 8. interesting 9. invented 10. joyable 11. relaxing 12. division 13. encouragement 14. unfriendly 15. widely

1. symbol 2. design 3. musicians 5. economical 6. simple 8. I think that you behaved badly to your father yesterday. 9. This tool can be used in various of way. 10. relatives 11. increasingly 12. humorous 13. dependency 15. enjoyable

sai bet

Trần Gia Đạo 1,25 mà <0,25x5 ak tính lại đi bn 

 số trung bình cộng của 254,55 và 185,45=(254,55+185,45):2=220

๖ۣۜH๖ۣۜU๖ۣۜY  ๖ۣۜR๖ۣۜI๖ۣۜO

vì là số lẻ nên tận cùng là các số 1;3 ;5 ;7;9 
gọi số cần tìm là a1a2a3a4 (nhớ có cái gạch dài trên đầu chúng nó nhá ) 
ta có 
a4 có 5 cách chọn 
a1 có 8 cách chọn (vì a1 khác 0 và khác a4 ) 
a2 có 8 cách chọn ( vì a2 khác a1 và khác a4 ) 
a3 có 7 cách chọn (vì a3 khác a4 và khác a1 và khác a2) 
(nhớ chuyển chữ khác thành dấu đúng của nó nhá ) 
theo qui tắc nhân ta có 
5 . 8 .8 .7 =2240 (số)

Nếu đúng k dùm mình ạ