Bài làm

~ Tự vẽ hình nha ~

a) Trên nửa mặt phẳng có bờ chứa tia Ox có:

\(\widehat{xOz}< \widehat{xOy}\left(50^0< 100^0\right)\)

=> Oz nằm giữa hai tia Ox và Oy.

b) Vì Oz nằm giữa hai tia Ox và Oy.

=> \(\widehat{xOz}+\widehat{yOz}=\widehat{xOy}\)

hay \(50^0+\widehat{yOz}=100^0\)

=> \(\widehat{yOz}=100^0-50^0\)

=> \(\widehat{yOz}=50^0\)

c) Ta có: \(\widehat{xOz}=50^0\)( theo đề bài )

Và \(\widehat{yOz}=50^0\)

 => \(\widehat{xOz}=\widehat{yOz=}50^0\)

=> Oz là tia phân giác của góc xOy

d) Trên nửa mặt phẳng có bờ chứa tia Ox có:

\(\widehat{xOz}< \widehat{xOm}\left(50^0< 70^0\right)\)

=> Oz nằm giữa hai tia Om và Ox.

Ta có: \(\widehat{xOz}+\widehat{mOz}=\widehat{xOm}\)

hay \(50^0+\widehat{mOz}=70^0\)

=> ​\(\widehat{mOz}=70^0-50^0=20^0\)​

Vậy \(\widehat{mOz}=20^0\)

Gọi d là ƯC(3x + 2 ; 5x + 3)

\(\Rightarrow\hept{\begin{cases}3x+2⋮d\\5x+3⋮d\end{cases}\Rightarrow}\hept{\begin{cases}5\left(3x+2\right)⋮d\\3\left(5x+3\right)⋮d\end{cases}\Rightarrow}\hept{\begin{cases}15x+10⋮d\\15x+9⋮d\end{cases}}\)

=> ( 15x + 10 ) - ( 15x + 9 ) chia hết cho d

=> 15x + 10 - 15x - 9 chia hết cho d

=> ( 15x - 15x ) + ( 10 - 9 ) chia hết cho d

=> 1 chia hết cho d

=> d = 1

=> ƯCLN(3x + 2 ; 5x + 3) = 1

=> \(\frac{3x+2}{5x+3}\)tối giản ( đpcm )

a)

b) Ta có: \(\widehat{xOy}+\widehat{yOz}=180^0\)(kề bù)

=> \(\widehat{yOz}=180^0-\widehat{xOy}=180^0-130^0=50^0\)

c) Do Om là tia phân giác của góc xOy

=> \(\widehat{xOm}=\widehat{mOy}=\frac{\widehat{xOy}}{2}=\frac{130^0}{2}=65^0\)

Oy nằm giữa Om và Oz nên \(\widehat{zOy}+\widehat{yOm}=\widehat{zOm}\)

=> \(\widehat{zOm}=65^0+50^0=115^0\)

a) Trên cùng một nửa mặt phẳng bờ chứa tia Ox ta có: góc xOy<góc xOz(65 độ<130 độ) nên tia Oy nằm giữa 2 tia Ox và Oz.(1)
b)Ta có: góc xOy+góc yOz=góc xOz
=> góc yOz=góc xOz-góc xOy=130 độ-65 độ=65 độ
=>góc yOz=góc xOy(=65 độ)(2)
Từ(1)và(2)=> Tia Oy là tia phân giác của góc xOz
c)Ta có:góc yOz+góc yOm=180 độ(kề bù)
=>góc yOm=180 độ-góc yOz=180 độ-65 độ=115 độ
Ta có:góc xOz+góc xOm=180 độ(kề bù)
=>góc xOm=180 độ-góc xOz=180 độ-130 độ=50 độ

refer to your dentist !!!

In different trips and outings. Every place is interesting and unique, but I was very impressed to go out in Da Lat, which is known as the land of beautiful flowers. This is also the most unforgettable outing in my life. From Ho Chi Minh City to Dalat takes about 5-6 hours by car and about 127km long. When I left was the year I was in the sixth grade on my birthday.

The evening before I went to my family I was fully prepared for this trip. On Monday morning, my family rented a seven-seat tourist car at the top of the road. At 5:15, my family started to go and I was excited for the trip. The city in the early morning is cool and fresh, so pleasant. At the time, the vehicles were sparse.When I got out of the city, the car started to accelerate, I sat in the window of the car so I could comfortably watch everything on the road. About 2 hours after the car I was crossing a vast forest of rubber trees in succession, then from a distance I could see the majes high mountains. The scenery is different every time so it cannot be described.

The fruit here is very fresh and has a sweet taste that looks very eye-catching: strawberries, butter, plums, peaches, grapes are delicious and cheap. I bought three for a jar of oranges, strawberries and a number of different fruits. When it got dark, my family took me to eat at the night market, the market here is no different from the market in my city but it is still very crowded.

And fleetingly three days in Da Lat really fast. It was time to say goodbye to this place to return to my house. When the car left, I was still attached to gazing at the rubber forests, the misty hills and the winding roads and beautiful flower gardens ... Goodbye! Da Lat met one day to meet again.

*Ryeo*

Please refer to this arle again !!!

I have been traveling in many cities Trang, Vung Tau, Da Nang, ... but the place I travel the most and the most impressive is Da Lat, a dreamy city with beautiful Ca Tu Cau flowers. pretty.

The day before I left, I was so excited and packed up very early, I couldn't sleep because I was looking forward to going this time. As soon as I got in the car, I had fallen asleep since I was unable to sleep that night. I had a good sleep.

At around 7 am, my family started to have breakfast at a nearby noodle shop which is also an acquaintance of my family. After eating, we went to a place to visit, which is known by many people as La An, which is located on a rather difficult mountain area. If you are on a trip, I think this is an interesting place for you to visit. Some interesting places to visit in Dalat are La An, Tiet Tinh Coc, Valley of Love, .... Da Lat also has many delicious restaurants such as Thanh Thao buttercream, grilled spring rolls and especially baked rice cakes on the side of the road. La An is a place for tourists to take pictures with the scenery here. Tourism places in Da Lat are mostly about the landscape. An equally beautiful and rugged place is Tiet Tinh Coc. This place is for young people who want to have beautiful photos and enjoy exploring the rugged road to Tiet Tinh Coc. But few people know that this place has a blue lake with natural stones. People will have a swing and a raft for you to shoot freely, but it costs money.It is often said that Dalat is the place for strawberry gardens, so there are quite a few places for us to pick strawberries. We will pay the farmers together to harvest the finished product. It is also the city of butter but delicious avocado has just arrived.

This is my favorite place and it has been associated with me since childhood. I will never get tired of this place no matter how many times I fish. I love Da Lat very much.

*Ryeo*

tỉ số của viên bi màu xanh với tổng số bi trong hộp là: 9/36

tỉ số của viên bi màu hồng với tổng số bi trong hộp là: 12/36

tỉ số của viên bi màu đỏ với tổng số bi trong hộp là: 15/36