Gọi số cần tìm là ab

Theo đề bài ta có ab9=13.ab

\(\Leftrightarrow\)ab.10+9=13.ab

\(\Leftrightarrow\)3ab=9

\(\Leftrightarrow\)ab=3???

Gọi số phải tìm là ab( a,b là số chữ số , a khác 0)

Ta có  9ab= 13 x ab

           900 +ab= 13 xab (cấu tạo số)

          12 x ab=900 (trừ cả 2 vế đi ab)

          ab= 900: 12

          ab=75

Vậy số phải tìm là 75.

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 sky 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 going to pagoda to wish good things will come to their familỵ
In my oppinion, i 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.

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 sky 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 going to pagoda to wish good things will come to their familỵ
In my oppinion, i 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.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 sky 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 going to pagoda to wish good things will come to their familỵ
In my oppinion, i 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.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 sky 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 going to pagoda to wish good things will come to their familỵ
In my oppinion, i 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.

Tet holiday is coming with a lot of wishes and hopes! The old year is full of happiness and sadness, So I hope the next year is a happy new year! I think a happy year will begin with best wishes and lucky money from my grandfather, papa,mama,and my relatives! 
Tet is an opportunity for me to enrich my pocket preparing for many intention in the next year! In tet holiday, going out with friends, visiting teachers, relatives and especially eating ! the most happy time in the holiday is the last night of the old year when I and my sister stay with my grandfather, the time change from the old year to a new year is the time we receive best wishes from each others!
So happy!

A = 1 + 2 + 2² + 2³ + ... + 2⁵⁹ + 2⁶⁰

2A = 2 + 2² + 2³ + 2⁴ + ... + 2⁶⁰ + 2⁶¹

2A - A = 2⁶¹ - 1

B = 3 + 3² + 3³ + 3⁴ + ... + 3²⁰¹⁸ + 3²⁰¹⁹

3B = 3² + 3³ + 3⁴ + 3⁵ + ... + 3²⁰¹⁹ + 3²⁰²⁰

3B - B = 3²⁰²⁰ - 3

B = 3²⁰²⁰−32  

ta có 

\(A=2^0+2^1+2^2+...+2^{60}\)

\(\Rightarrow2A=2+2^2+2^3+...+2^{61}\)

\(\Rightarrow2A-A=2^{61}-1\)

\(\Rightarrow A=2^{61}-1\)

tương tự với biểu thức B bạn lấy 3B - B còn 2B rồi chia cho 2 sẽ ra \(\frac{3^{2020}-3}{2}\)

16 = ( x - 1 )⁴

2⁴ = ( x - 1 )⁴

2⁴ = ( 3 - 1 )⁴

=> x = 3

k chắc ! Cũng ms hk 

Sai bỏ qua . Thanks

                             16 = ( x - 1 )⁴

                                   2⁴ = ( x - 1 )⁴

                             ( x - 1 )⁴ = 2⁴

                         => x - 1 = 2 

                              x       = 2 + 1

                              x       = 3

                    Vậy x = 3

Bác tài chỉ việc đi thôi .  Còn chiếc xe thì để ở lại .

Vì câu hỏi nói : Vậy đố các bạn làmsao bác tài qua được cây cầu này (Không được bớt hàng ra khỏi xe)?

Hk tốt !!

Nếu coi nửa sổ phải tìm là 1 phần thì 6 sẽ là 3 phần như thế . Vậy = 4 

Duyệt đi chúc bn học giỏi

Anien là một cô bé, một đêm cô đi ngủ khi ngủ thì cánh cửa đang mở nhưng không ai ở đó, cô nghĩ đó chỉ là con mèo, nó luôn làm cô khó chịu. Nhưng câu chuyện kỳ ​​lạ này luôn làm cô khó chịu. Cô cần phải nói với cô. cha. Trong câu chuyện, cô ấy kể câu chuyện kỳ ​​lạ cho bố cô ấy và anh ấy chỉ nói: 'ồ đó là con mèo con'. 'Nhưng con mèo con tôi đi qua trong bếp và khóa cửa'. Khuôn mặt, khuôn mặt anh ta trông rất lo lắng 'bạn có thấy bất kỳ người phụ nữ nào có máu mặt không, ...' cha anien hỏi 'no'.anien trả lời và cô ấy đi vào bếp và cô ấy hét lên' cha của cô ấy chạy vào Bếp anh thấy anien đang khóc và anh nhìn xuống bột mèo con anien bị mất .... đó là ... đầu. Anh xin anien và anien đi đến phòng ngủ của cô ấy khóc và cô ấy ngủ khi cô ấy ngủ Cánh cửa lại mở ra và anien thấy một người phụ nữ đang cầm dao và mở cửa, cô ấy đến gần anien và bắt đầu lấy máu của mình và cô ấy đặt con cặc với máu của Anien trên bàn và đi ra ngoài. nhắm mắt lại và khóc sau vài phút, những người phụ nữ quay lại và uống anien`blood sau đó cô ấy đi ra ngoài vào sáng hôm sau anien kể chuyện cho bố mẹ cô ấy và họ quyết định đổi nhà.

Bạn tải app google translate rồi chụp đoạn trên , nó sẽ dịch dùm bạn

Bài làm

Xét tam giác ABC có:

/ A + / B + / C = 180^o ( tổng số đo của ba góc trong tam giác )

hay  / B + / C = 180^o - 50^o 

=>   / B + / C = 130^o 

Số đo góc B là:

( 130^o + 40^o ) : 2 = 85^o 

Số đo góc C là:

130^o - 85^o = 45^o 

Đáp số: Góc B: 85^o 

             Góc C: 45^o 

# Học tốt #

theo tính chất tổng ba góc của 1 tam giác ta có :

góc A+ góc B + góc C = 180 độ

=> B + C = 180 - A

     B+ C   = 180 - 50 = 130

Mà B - C = 40

=> B = 130 - 40 = 90

=> ABC là tam giác vuông

theo tính chất hai góc nhọn phụ nhau trong một tam giá vuông

=> C = 40 
( bạn thêm kí hiệu góc và kí hiệu số độ vào hộ mình nhé, cả kí hiệu tam giác nữa )

1. are
2. lot
3. her
4. many
5. in
6. going 
7. lot of
8. Duyệt hộ cho mik nhé

Hi [tên người mình gửi cho họ],

Today I will tell you about my bedroom. When finding somewhere to escape from the hustle and bustle of life, my bedroom is always an ideal place. My bedroom is on the second floor. It is not exactly a large room but it is spacious enough to become my private world. It is a fully-furnished room with a single bed on the left and a wardrobe on the right corner. And there stands a wood table with a shelf that contains many interesting books and is decorated with lots of souvenirs and birthday gifts on the left corner. With two small windows on the two sides of the room, I use bright color tone for the wall to make my bedroom airier and warmer. My childhood memories is coupled with every corner of the room. In my deep thoughts, it is not only a place where greets me after strained long hours at work, brings me sweet dreams but also a friend that witnesses maturity in every step of my daily life. My bedroom- a small room but unintentionally becomes a vital piece in my whole life.

Please rewrite to me! I wish you always happy!

Your best friend,

    [ký tên abc]

Hội con 🐄 chúc bạn học tốt!!!

When finding somewhere to escape from the hustle and bustle of life, my bedroom is always an ideal place. My bedroom is on the second floor. It is not exactly a large room but it is spacious enough to become my private world. It is a fully-furnished room with a single bed on the left and a wardrobe on the right corner. And there stands a wood table with a shelf that contains many interesting books and is decorated with lots of souvenirs and birthday gifts on the left corner. With two small windows on the two sides of the room, I use bright color tone for the wall to make my bedroom airier and warmer. My childhood memories is coupled with every corner of the room. In my deep thoughts, it is not only a place where greets me after strained long hours at work, brings me sweet dreams but also a friend that witnesses maturity in every step of my daily life. My bedroom- a small room but unintentionally becomes a vital piece in my whole life.

Nguồn : Đoan văn giới thiệu miêu tả phòng ngủ bằng tiếng Anh hay có dịch