Diện tích mái nhà là:

( 8,5 + 6,5 ) x 6 : 2 = 45 ( m\(^2\))

Diện tích viên ngói là :

0,3 x 0,2 = 0,06 ( m\(^2\))

3/5 diện tích của viên ngói là :

0,06 : 5 x 3 = 0,036 ( m\(^2\))

Cần số viên ngói là:

45 : 0,036 = 1250 ( viên )

1 viên ngói có giá là 

420000 : 400 = 1050 ( đồng )

Số tiền mua ngói là

1050 x 1250 = 1312500 ( đồng )

Đáp số 1312500 đồng 

Tk mình nhé

Chúc bạn học giỏi

Tại sao vậy ạ???

Vì tôn dẫn nhiệt tốt hơn ngói. Vào mùa hè, nhiệt truyền từ ngoài trời (nhiệt độ cao hơn) vào nhà (nhiệt độ thấp hơn). Vì thế, mái tôn dẫn nhiệt vào nhà nhiều hơn mái ngói, vì vậy nhà lợp mái tôn nóng hơn.

Hình vẽ đâu bạn nhỉ?

Vì lợp so le nên cứ 1 hàng lợp 11 viên nguyên lại đến 1 hàng bắt đầu bằng nửa viên rồi đến 10 viên và kết thúc bằng nửa viên. vậy cứ 2 hàng lại phải cắt 1 viên, cả 2 mái có 22 hàng nên phải cắt 11 viên

My house has a livingroom which is in the second floor and it’s quite narrow. The floor is paved with green flowered bricks and the wall is paved with white flowered bricks. These colour make the room more bright.
It has one door and two windows. One window is near the steps and the other one is it's opposite. From this window, we can see blue sky and mild sea. This window is always opened to welcome the sunshine. It’s the most wonderful thing of this room.
In the middle of the room, there is a brown sofa with a black glass coffee table. They are very suitable with each other. Because my Mom likes to decorate this room naturally, there is always a vase of fresh flowers on the coffee table. This makes our living room more beautiful so much.
Besides, our living room has a big black TV which is on a square cabinet, some pictures on the wall and some calendars.
I like reading books and listening to music in our living room. It makes me feel comfortable and relaxed so much. So the living room is the most favourite room of mine in the house.

This is my house . It has three floors . It is yellow . There are five rooms in my house .First is a big brown door . Living room is yellow . In the living room , there are two windows , a sofa , a big television , three ceiling fans , four trees and many furniture . They are nice . Next , it is kitchen . This is where my family cooking and eating .It is blue . It has a big dining table , a television , a window and three trees . And this is bathroom . It is very comfortable . Everyday , I brush my teeth and wash my face here . They are down floor .

Up floor , my bedroom and parents' bedroom . I love my bed very much . My bed has a bed , a desk , a wardrobe and a small sofa . It aslo has many trees , a television and two window . I think it is very nice and big because it is pink and many furniture . Near my bedroom is parents' bedroom . It is violet . There are two windows ,a bed , a television , a wardrobe and three trees . My mother this room because this is where my parents rested .

I love my house so much

Hi everybody! I am Anh,today will talk about my home. We live in a small house in the center of Hanoi. My house is small but it is very beautiful. There are 3 floors in the house and it has 3 bed rooms, one kitchen and living room together, others is bed rooms. It is not a fantas house but comfortable. In my bedroom, we has bed, wardrobe, desk and computer…. The living room is small but it is very nice and the kitchen is very convenient. I prefer the comfortable than the fabilous. My house also has a small garden with some trees and flowers. My house isn’t large but it very beautiful, and I love this house so much.

This is my house. My house has 7 rooms which are the living room, my parent’s the bedroom, my the room, the kitchen, the dining room, the bathroom and the toilet. In the livingroom, you will see the altars the first. It is put in high position highly. In the mid-room, table and chair are put in here there are chairs and tables. (not sofa, not armchair). We have some pictures on the above wall. The TV is put behind the table and the chairs .In my the room, the computer is put beside the desk and the bookshelf is put next to the desk. On the left, the bed is put near the wardrobe.In the kitchen, the cupboard is put near the refrigerator and the stove and the cooking rice.

Những từ phức trong đoạn văn trên là :

- Mùa xuân ; buổi chiều ; hửng ấm ; đàn chim én ; dãy núi ; lượn vòng ; bến đò ; xập xè ; mái nhà ; cao thấp.

Chúc bạn hok tốt !