b, \(2\cdot\left(x+7\right)-6=18\\ 2\cdot\left(x+7\right)=18+6=24\\ x+7=\dfrac{24}{2}\\ x+7=12\\ x=12-7\\ x=15\)

There are many things in this world you can interested in, but there is only one thing make you happy, is your house with your family live in. My house is not a very big, but not very small.. It's very large if talking about area, it's about 75 square meters. It have a colour of blue with 4 floors. My house always have 3 motorbike in the houseyard for my parents and my sister. Inside the house, in the first floor, there is a living room, a kitchen and a restroom. My grandpa always watching TV in the living room while my grandma is cooking in the kitchen. In the second floor, it's my grandparents rooms. In the left is my grandma room, and in the right is the grandpa one. It also have a restroom for them. In the third floor, that's my parents room and my room. I very very love my room because it has many memories and things that I love and consider them treasures. And in the tallest floor, the fourth floor, in the left, it has an altar room, and my grandma sometimes come inside it and pray for my family a better live. In the right side, it's clothesline room. My father also planted a lots of orchid inside it. To summarize, my house is the most important and meaningful place for me. That's the place I was born and grow with all sadness and happiness I experienced .I love it so much, love it more than anyone in the world.

There are many hobbies that you can have a choice for reduce stress or entertain yourself, but some of them are not like that, they are very dangerous to do... Some unsafe game, activities included in this list are: parachute, climb to a very tall buildings, or playing ghost houses... They are dangerous because it can cause many health problems like: injuried, depression, or even die. Another reason for why hobbies and interests are dangerous, that if you dont do anything dangerous, it still dangerous if you do it wrong. Like: Doing your hobbies to much, and you can't concentrate to other activites; Doing hobbies in a wrong way make it not in the right way... From all of these words, i just want to say: 'You can do anything you want, but you need to do that safe and correctly for better result or relaxing after a long day of working or studying'

1m vải mua hết:

  250000 : 5 = 50000 (đồng)

6,8m vải mua hết:

  50000 x 6,8 = 340000 (đồng)

Cửa hàng có tất cả: 

  316 x 3 = 948 (kg)

1) 

 \(134\cdot\left(-76\right)+348\cdot\left(-24\right)-214\cdot76\\ =-76\cdot\left(134+214\right)+348\cdot\left(-24\right)\\ =-76\cdot348+348\cdot\left(-24\right)\\ =348\cdot\left(-76+\left(-24\right)\right)\\ =-34800\)

(-7)x = 42

     x = 42 : (-7)

     x = -6

2. Watching - living room

3. Listening - bedroom

4. Washing - house

5. Brushing - bedroom

6. Riding - yard

7. Talking - living room

Nửa chu vi hình chữ nhật:

  28 : 2 = 14 ( m )

Chiều dài của hình chữ nhật là:

  14 : ( 2 + 5 ) x 5 = 10 ( m )

Chiều rộng của hình chữ nhật là:

  14 - 10 = 4 ( m )

Diện tích hình chữ nhật là:

  10 x 4 = 40 ( m² )

Khóc: thút thít, rên rỉ, sụt sịt, buồn vã, đau khổ

Cười: vui vẻ, vui sướng, khúc khích, hi hi, ha ha