ta có: A+B+C=180⁰(tổng 3 góc tam giác) mà C=90⁰(vuông ở C ) suy ra A+B=90⁰ mà B=2A suy ra A+2A=90⁰ suy ra A=30⁰ suy ra B =60⁰

a, vì DCA kề bù với C suy ra DCA +C=180⁰ mà C=90⁰suy ra DCA=90⁰ suy ra DCA=C

xét tam giác ADC và ACB: DCA=C, CD=CB, AC cạnh chung suy ra tam giác ADC = ACB suy ra DAC=CAB và AD=AB

b, xét tam giác AMC, ANC:  DAC=CAB, AC cạnh chung, AM=AN suy ra  tam giác AMC=ANC suy ra MC=CN

c,xét tam giác MAC,NAC: DAC=CAB, AI cạnh chung , AM=AN suy ra  tam giác MAC=NAC suy ra AIM=AIN và IM=IN

d, vì AIM kề bù IAN suy ra AIM+IAN=180⁰ mà AIM=AIN suy ra AIN+AIN=180⁰ suy ra AIN=90⁰

vì AIN=90⁰ và C=90⁰ suy ra MN //BD

k ???????

Dear Liu!

Last time I told you that I had been thinking about pursuing higher education in the UK. I got started to learn the process of applying for a university in London some time ago. Now I have some questions for you. 

First, what is the procedure for applying for a student visa? Of course. I have to submit an application but what other documents are required? How long does it take me to obtain my student visa? It is important to plan time to wait for visa processing because the time between finding out I have been accepted to go and leaving may be very close together. Second, do 1 have to present my financial documents; for example proof of funds, to prove that I am able to pay for my education? And last, do I need to obtain the International Certificate of Vaccination? Is it required that I have certain vaccinations before I go? What are they? After all. can you make me a checklist: what I should bring and what I should leave at home? 

I wish you and your family the best. I look forward to hearing from you soon. 

                                                                                                     Regards, 

                                                                                                     Mai Anh

Mong cô duyệt bài ạ:

Dear Duc Son,

Last time I told you that I had been thinking about pursuing higher education in the UK. I got started to learn the process of applying for a university in London some time ago. Now I have some questions for you.

First, what is the procedure for applying for a student visa? Of course. I have to submit an application but what other documents are required? How long does it take me to obtain my student visa? It is important to plan time to wait for visa processing because the time between finding out I have been accepted to go and leaving may be very close together. Second, do 1 have to present my financial documents; for example proof of funds, to prove that I am able to pay for my education? And last, do I need to obtain the International Certificate of Vaccination? Is it required that I have certain vaccinations before I go? What are they? After all. can you make me a checklist: what I should bring and what I should leave at home?

I wish you and your family the best. I look forward to hearing from you soon.

Regards,

Dang Phong

10 nha

kobit

hahaha

ngan 1:400

ngan 2:600

giải đầy đủ là gì

minh cung giong ban ne

minh ghet bai nay lắm

150 trang . 

3/4 tổ một bằng 1/2 tổ hai => Ta có sơ đồ sau:

8 người Tổ 1 Tổ 2

Nhìn vào sơ đồ ta thấy: Tổ 1 gồm 4 phần bằng nhau. Tổ 2 gồm 6 phần bằng nhau.

=> Hiệu số phần của tổ 2 và tổ 1 là: 6 - 4 = 2 (phần)

2 phần ứng với 8 người => Giá trị 1 phần là: 8 : 2 = 4 (người)

=> Tổ 1 có: 4 x 4 = 16 người

      Tổ 2 có: 6 x 4 = 24 người

Cả hai tổ có: 16 + 24 = 40 người.

Có tất cả 40 công nhân !

 100% đúng ! Yik đúng cho mk nha ! kb ko !

1  A;.I won"t feel well enough to go to station to meet him

B;I will meet him for you,how I recognize him

A;He small and he wearing a black cap

2..A:This place is dirty.B;I'm sorry.I will bring you another

3.In a few minutes'time when the clock will strickes six,I'm waiting for you here

4.If you calling her at six,she probably   practise  playing the piano

5.If he work hard,he will pass the entrane exam to the university.

6.If you come at the seven ,I"m working in my garden

7.we will be pleased ìf your school win the match

8.Tomorow  after noon at this time,I will flying to Carribean

9.

mình llười đọc quá nên ko làm hết đc ming bạn thông cảm nha

_ffhfd4

Đặt \(d=\left(a+b+2,2a+b+1\right)\).

\(\Rightarrow a^2=\left(a+b+2\right)\left(2a+b+1\right)⋮d^2\)

\(\Rightarrow a⋮d\).

\(\left(2a+b+1\right)-\left(a+b+2\right)=a-1⋮d\Rightarrow1⋮d\).

Do đó \(d=1\).

Suy ra \(a+b+2,2a+b+1\)đồng thời là các số chính phương.