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Đáp án C

theo mình là ;

c.4 ➝1➝ 3➝ 2

C. 4 → 1 → 3 → 2 

C.4 ->1->3->2 👍

Thứ tự đúng: 3 – 1 – 2

Gọi x (dãy) là số dãy ghế ban đầu của phòng họp.

Điều kiện: x ∈N*

Khi đó số ghế ngồi trong một dãy là: 360/x (ghế)

số dãy ghế sau khi tăng là x + 1 (dãy)

số ghế ngồi trong một dãy sau khi tăng là:

Theo đề bài, ta có phương trình: 

⇔ 400x – 360(x + 1) = x(x + 1)

⇔ 400x – 360x – 360 = x 2  + x ⇔  x 2  – 39x + 360 = 0

∆ = - 39 2  – 4.1.360 = 1521 – 1440 = 81 > 0

∆ = 81 = 9

Cả hai giá trị của x đều thỏa mãn điều kiện bài toán.

Vậy bình thường trong phòng có 15 hoặc 24 dãy ghế.

Hi. My name is Hakim. I am from Malaysia. I would to introduce my future home.

My house has three floors: a basement and two floors. Includes seven rooms. Consists of a living room, a kitchen, a bathroom on the first floor. One bedroom, one gym room and one office on the second floor. My house has a very large terrace. There was a TV in the living room, five pictures of my family and two sofas. The kitchen consists of a gas stove, a table and four loungers. There is also a refrigerator in the kitchen. Inside the bathroom there is a tub. In my room there was a large bed, also a TV and two windows. Inside the basement is a studio and a bar room. To the right of the house is a swimming pool. To the left of the house is a rose garden.

thanks Min-Ji

Hello, my name is Hakim. I'm from Malaysia. I would to introduce about my house in the future.

My house has three floors: a basement and two floors. My house has seven rooms. Including a living room, a kitchen, a bathroom on first floor. A bedroom, agym and a work room. My house has a big yard. There's a TV, five pictures about my family and two sofas in the living room. My kitchen has a gas stove, a table and a recliner( ghế tựa). There's also a fridge at the kitchen. On my bathroom has a bath. On my room has a big bed and also a TV and two windows. On the basement is a studio and a bar room. On the right of my house, there's a swimming pool. On the left of my house is a rose garden.

======== Good studying! ===========

a → b → e → c → d → g