vì CPU có thể thực hiện các chứ năng tính toán, điều khiển, điều phối mọi hoạt động của máy tính

Bởi vì nếu gia đình tôn trọng kỉ luật thì sẽ có nề nếp kĩ cương

Trọng lượng của 2 bao cát là:
P=10.m=>10.100=1000(N)
Trọng lượng của 2 người là
400.2=800(N)
Hai người này không kéo được bao cát lên sàn ô tô vì trọng lượng của 2 người ít hơn trọng lượng của vât(800N < 1000N)
CHÚC BAN HỌC GIỎI

1.Your Neighbourhood
My neighbour hood is near the Central of the city.It's quiet and clean.The streets are not busy.The building are not tall,so the air is fresh.There is a primary school near my house.There are a lots of tall trees .The people are kind and friendly.The food is good and cheap.There are many cafe but there isn't any shops.So I usually go to the supermarket three times a month.
2.Natural Wonders of the Word
There are a lot of Natural Wonders on the words but I like Ha Long Bay best.It's in Quang Ninh Province.It has many island and caves.Tuan Chau is the biggest island in Ha Long Bay.The Vietnamese seafood is great.We can join exciting activities in here.If we visit Ha Long Bay,we can explore many caves and take a boat ride around island.Ha Long Bay is VietNam's most beautiful natural wonder
6.Our Tet Holiday
Tet is a traditional holiday of our country Vietnam.
The season of Tet occurs around the biginning of February and end of Janaurỵ The meaning of Tet is ending old year and welcome a new year. Tet holiday is very special for Vietnamese families to reunite. At that time, all family members try to come back their homes and get together to prepare for Tet. Moreover they will buy new clothes and clean their house. A branch of Mai flower or a Kumquat tree can't be absent from every home. They bring a fresh atmosphere to the house. We decorate ancestral altar with a tray full of fruits and flowers.
Some typical Tet's food such as sweets, coconut jam, candied fruits, lemon seeds, rice cake , "thit kho"( stew pork with eggs). A special food can not absent is sticky rice cake.. It is our country's traditional food on Tet holiday. Tet meal is more dilicious than our every day.
On Tet holiday, people have many typical activities. Young persons takes part in the traditional games such as: tug; cooking rice, cock fighting, watching lion dance. Many people visit relatives to wish a happy new year. A dults will give lucky money for children. Woman like going to pagoda to wish good things will come to their familỵ
In my oppinion, i like cozy and fresh Tets atmosphere. All member of family talk together about a happy new year. I can hang out with my friend and don't worry about any thịng
" Tet" holiday is always in Vietnamese's heart.