b: Xét tứ giác ADME có

\(\widehat{ADM}=\widehat{AEM}=\widehat{DAE}=90^0\)

Do đó: ADME là hình chữ nhật

Bài 6: (1.5 điểm) Hãy viết tập hợp sau bằng cách chỉ rõ tính chất đặc trưng của các phần tử thuộc tập hợp đó:
C = {2; 6; 12; 20; 30}. 
Kết quả

giúp mình với mình đang cần gấp!

có 10 tập hợp con nha bn

Đây nhé bạn

a)\(\frac{20}{-160}=-\frac{1}{8}\)

b)\(\frac{-24}{-72}=\frac{1}{3}\)

c)\(-\frac{270}{450}=-\frac{3}{5}\)

d)\(\frac{3.7.11}{33.14}=\frac{33.7}{33.14}=\frac{7}{14}=\frac{1}{2}\)

e)\(\frac{49+7.49}{-49}=\frac{49.\left(1+7\right)}{-49}=\frac{49.8}{-49}=-8\)

\(a,\frac{20}{-160}=\frac{-20:20}{160:20}=\frac{-1}{8}\)

\(b,\frac{-24}{-72}=\frac{-24:24}{-72:24}=\frac{-1}{-3}=\frac{1}{3}\)

\(c,\frac{-270}{450}=\frac{-270:90}{450:90}=\frac{-3}{5}\)

\(d,\frac{3.7.11}{33.14}=\frac{3.7.11}{3.11.7.2}=\frac{1}{2}\)

\(e,\frac{49+7.49}{-49}=-\frac{49.\left(7+1\right)}{49}=-8\)

Học tốt

a) 20/-160 = 1/-8             b) -24/-72 = 1/3              c) -270/450 = -3/5     

d) 3.7.11/33.14 = 3.7.11/3.11.7.2 = 1/2     

 e) 49+7.49/ -49 = 7.7+7.49/-49 = 7.(7+49) /-49 = 7.56/-49 = 392/-49 = -8

refer

1. We are trying to introduce our handicraft products to foreign tourists in order that we promote our culture.

2. Although Bat Trang village is quite far from my place, I still want to go there with my friend this weekend

3. The development of traditional handicrafts in Vietnam has faced up to many challenges

4. He is going to take charge of his family business because his parents are very old

5. Most people in this village live on making traditional handicrafts.

1 We are trying to introduce our handicraft products to foreigner in order that we can promote our culture

2 Allthough BatTrang village is quite far from my place, I still want.......

3 The developement of traditional handicrafts in VN has faced up to many challenges

4 He is going to take charge of his family business because his parents are very old now

5 Most people in this village live on making traditional handicrafts

1. We are trying to introduce our handicraft products to foreigner tourists in order that we can promote our culture.

2. Although Bat Trang village is quite far from my place, I still want to go there with my friend this weekend.

3. The development of traditional handicrafts in Vietnam has to face up to many challenges.

4. He is going to take charge of his family business because his parents are very old now.

5. Most people in this village live on making traditional handicrafts.

Xét △DEC và △BAC có

góc D chung

góc CDE= góc CBA (=90)

Vậy △DEC đồng  dạng △BAC (g_g)

=> \(\frac{CD}{BC}=\frac{EC}{CA}\Rightarrow\frac{CD}{EC}=\frac{BC}{CA}\)

Xét △EAC và △DBC có

góc C chung

\(\frac{CD}{EC}=\frac{BC}{CA}\)(cmt)

Vậy △EAC đồng dạng △BDC (c_g_c)

=> góc CEA = góc CDB

Ta chứng minh được tam giác DHB vuông cân (góc H = 90 ,DH=HB)

=>gócHDB=45 hay là là góc BDA =45 (nó cùng là 1 góc nhưng do cách gọi tên thôi)

Ta có

\(\hept{\begin{cases}gocCEA+gocAEB=180^o\\gocCDB+gocBDA=180^0\end{cases}}\) 

Mà góc CEA = góc CDB

=> góc AEB=góc BDA 

Mà góc BDA=45

=> góc AEB=45

Xét tam giác EBA có

góc E=90

góc EBA=45

=>góc DAB =45

=> tam giác ABE vuông cân tại E

=> BA=BE

T I C K nha 

____________________Chúc bạn học tốt ______________________

Các bạn giúp mình với ^^ 

SÁNG MAI ĐƯỢC KO  ! NẢY GIỜ GIÚP NHÌU BẠN QUÁ BUỒN NGỦ QUÁ

a: \(A=\dfrac{x\left(x+2\right)}{\left(x-2\right)^2}:\dfrac{x^2-4+x+6-x^2}{x\left(x-2\right)}\)

\(=\dfrac{x\left(x+2\right)}{x-2}\cdot\dfrac{x}{x+2}=\dfrac{x^2}{x-2}\)

c: A<0

=>x-2<0

=>x<2

d: B nguyên

=>x^2-4+4 chia hết cho x-2

=>x-2 thuộc {1;-1;2;-2;4;-4}

=>x thuộc {3;1;4;6}