a: Xét tứ giác AEHF có 

\(\widehat{AEH}=\widehat{AFH}=\widehat{FAE}=90^0\)

Do đó: AEHF là hình chữ nhật

1 How long do you live in HN

2 How often did you go to the movies

3 What did Mrs Robinson buy

4 When was your father in Nghe An

5 How do they go to school

6 Why didn't she go to class

7 Who left home at 7o'clock yesterday

8 What subject does he study in the high school

9 What is your favorite hobby

10 How far is it

a, \(\angle\left(A1\right)+\angle\left(A2\right)=180^o\left(ke-bu\right)=>\angle\left(A2\right)=180^0-60^0=120^o\)

\(=>\angle\left(A2\right)=\angle\left(B1\right)=120^o\)

mà 2 góc này ở vị trí so le trong \(=>Ax//By\)

b, \(\angle\left(B3\right)+\angle\left(C\right)=130^o+50^0=180^o\)

mà 2 góc ở vị trí trong cùng phía \(=>By//Cz\)

a: Xét ΔABE vuông tai A và ΔHBE vuông tại H có

BE chung

gócABE=gócHBE

=>ΔABE=ΔHBE

b: ΔBAE=ΔBHE

=>BA=BH; EA=EH

=>BE là trung trực của AH

\(b,\dfrac{2x}{7x-21}=\dfrac{2x\left(x+3\right)}{7\left(x-3\right)\left(x+3\right)};\dfrac{x+2}{x^2-9}=\dfrac{7\left(x+2\right)}{7\left(x-3\right)\left(x+3\right)}\\ c,\dfrac{3x}{5x^2-30x}=\dfrac{3}{5\left(x-6\right)}=\dfrac{3\left(x-6\right)}{5\left(x-6\right)^2}\\ \dfrac{x+1}{x^2-12x+36}=\dfrac{5\left(x+1\right)}{5\left(x-6\right)^2}\\ d,\dfrac{2x-1}{5x^2+35x}=\dfrac{\left(2x-1\right)\left(x+7\right)}{5x\left(x+7\right)^2};\dfrac{x-2}{x^2+14x+49}=\dfrac{5x\left(x-2\right)}{5x\left(x+7\right)^2}\)

BẢO THẦY N guyễn Hàng Minh ý 

was

was

were

were

wasn't

weren't

was

was

remembered

ate

had

did she not buy

didn't talk

did they not come

did-go

went

tách ra 1 câu hỏi 10 câu thôi c:v

1was

2was

3were

4were

5wasn't

6weren't

7weren't

8wasn't

9were

10was-was

11was

12remembered

13ate

14had

15Didn't she buy

16didn't talk

17Didn't they come

18did they go-went

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