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

Uy tín vì đây là bài tập về nhà nhưng me sẽ phải uống hoạt huyết nhất nhất để làm hết bài này

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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