Gọi chiều dài của mảnh vườn là x (m) ( x > 0 | x ∈ N )

Thì chiều rộng của mảnh vườn là x - 10 (m)

 Vì mảnh vườn có diện tích 1200m²

Ta có phương trình:

x(x-10)=1200

⇔ x² - 10x - 1200 = 0

⇔ x² + 30x - 40x - 1200 = 0

⇔ ( x - 40 )( x + 30 ) = 0

⇔[x−40=0x+30=0[x−40=0x+30=0 

⇔[x=40(TMĐK)x=−30(KTMĐK)[x=40(TMĐK)x=−30(KTMĐK) 

Vậy chiều dài của mảnh vườn là 40m

⇒ Chiều rộng của mảnh vườn là: 40 - 10 = 30 (m)

lỗi

Tham Khảo

Nha Trang is one of the most beautiful coastal cities in Vietnam. The last time I came here was 1 year ago. Nha Trang is located in Khanh Hoa province. It takes 3 hours to get there by car from my house. It was a sunny day and my brother drove everyone along. We arrived in Nha Trang at 5pm. This place was wonderful. The scenery here makes me feel peaceful and gentle. Waves of waves, gentle sea breezes, long stretch of white sand and clear blue sea water. All of these were looking to paint a picture of a beautiful landscape. We stayed there 2 days and 3 nights. We rented rooms in a five-star hotel. Everything here is very comfortable. The cleanliness I like best in this hotel is the cleanliness. We have 4 people so we rented out 2 rooms. My dad and brother stay in one room. Me and my mother stay in one room. Every morning I get up early to go for a walk and watch the sunrise. After that, I will return to the hotel to have breakfast with everyone. Then we went to visit the small islands here. There are Tre Island, Monkey Island, and Yen Island. After going all over the islands we visited the Ponaga Cham Tower. The special architecture of the Cham structure has created this place. My family sunbathe together on the white sand beach and together enjoy glasses of fragrant coconut water. My brother and I play together in the sea water. With a beautiful beach, this place has a lot of tourists. If I have time I would love to be able to come back here again.

Tham Khảo

I have a breakfast is in the morning, a lunch is in the noon and a dinner is in the evening: In the morning, I often eat bread or rice and drinking fruit drink, sometimes I eat porridge. In the noon, I often eat rice with foods and in the evening, I eat rice with foods, too. I also eat snacks in the afternoon in everyday, I sometimes eat with my friends and we very happy. I always drinking milk at before go to bed in the evening. I also eat fruit, because they are delicious and nutritious.