Giải

Năm 2012 có số dân tăng thêm là:

    7 500 000 x 1,2% = 90 000 (người)

Năm 2012 thành phố Hồ Chí Minh có số dân là:

   7 500 000 + 90 000 = 7 590 000 (người)

Đ/S: 7 590 000 người

mình cần gấp lắm các bạn giúp mik nha

198

Chiều cao của tam giác ban đầu là : 

756 x 2 : 42 = 36 m 

Để S mảnh đất tăng thêm 90 m² 

=> Đáy phải tăng thêm 90 x 2 : 36 = 5 m 

Bài 1: tìm lỗi sai

1. She goes to visit her grandmother and grandfather next week

=> will go

2. Which place is Phuong and Mai going to visit firts?

=> are

3. They are going in vacation this summer

=> on

4. He wants visit the temple and take some photos

=> to visit

5. They always are going to have a picnic in the park on the weekend

=>  \(\varnothing\)

6. It is on of the higher mountains in the world

=> highest

7. This city has a population for 6.3 milion

=> of

8. She always go to Hong Kong on summer vacation

=> goes

9. The River Nile is 6,437 kilometers length

=> long

10. Tomorrow, I am going to visiting the Tower of LonDon

=> am going to visit

1. Every moring, my father (have) __has______ a cup of coffee but today he (drink) _drinks______ milk

2. At the moment, I (read) __am reading_______ a book and my brother (watch) _is watching_______ TV

3. Hoa (live) lives______ in Hanoi, and Ha (live) __lives_____ in HCM City.

4. Hung and his friend (play) _play____ badminton

5. They usually (get up) _____get up_______ at 6.00 in the morning.

6. Ha never (go) _goes_____ fishing in the winter but she always (do) _does______ it in the summer.

7.My teacher (tell) _tells______ Hoa about Math.

8. There (be) _are_______ animals in the circus.

9. __What__does_____ he (watch) __watch_____ TV at 7.00 every morning ?

10. What __does______ she (do) _do____ at 7.00 a.m ?

11. How old _is_____ she ?

12. How __is_____ she ?

13. MY children (go) _goes______ to school by bike 

14. We (go) _go______ to supermarket to buy some food.

15. Mr.Hien (go) _goes_____ on business to Hanoi every month

16. Ha () ___s___ coffee very much, but I (not ) _don't _____ it

17. She () _s____ Tea, but she (not ) _don't ______ coffee

18. I (love) _love_____ cats, but I ( not love) _don't love______ dogs

19. Everyday, I (go) _go_____ to school on foot, but today I (go) _go_____ to school by bike

20. Who do you ( wait) _wait____ for Nam?

- No, I (wait) _wait______ for Mr.Hai

Cảm ơn cậu nhé

Gọi chiều dài là a (m) ; chiều rộng là b(m)

Ta có : Nửa chu vi hình chữ nhật là : 150 : 2 = 75 m 

=> a + b = 75 (1)

mà 3 x a = 2 x b

Lấy (1) nhân 3 theo vế ta có : 

3 x (a + b) = 3 x 75

=> 3 x a + 3 x b = 225

=> 2 x b + 3 x b = 225 (Vì 3 x a = 2 x b)

=> 5 x b = 225

=> b = 45 

=> a = 75 - 45 = 30 

Vậy chiều dài dài 30 m ; chiều rộng dài 45 m ???

=> S = 30 x 45 = 1350 m²