a) Xét tam giác MAB và tam giác MCD , có :

góc AMB = góc CMD ( đối đỉnh )

MA = MC ( M là trung điểm của AC )

MB = MD ( gt )

=> tam giác MAB = tam giác MCD ( c-g-c )

Vậy tam giác MAB = tam giác MCD ( c-g-c )

=> góc ABM = góc CDM ( 2 góc tương ứng ) mà hai góc ở vị trí so le trong nên AB // CD

b) Xét tam giác MBC và tam giác MDA , có :

góc BMC = góc DMA ( đối đỉnh )

MA = MC ( M là trung điểm của AC )

MB = MD ( gt )

=> tam giác MBC = tam giác MDA ( c-g-c ) => góc DAM = góc BCM ( hai góc tương ứng )

Xét △ABC và △CDA ,có :

AC : chung

góc BAC = góc DCA ( tam giác MAB = tam giác MCD )

góc DAM = góc BCM ( chứng minh trên )

=> △ABC = △CDA ( g-c-g )

Vậy △ABC = △CDA ( g-c-g )

Read the following text and choose the best answer.

Son Doong Cave was discovered in ______.

A. 2015

B. 2013

C. 2009

D. 1991

..............680 m2

tich nha

I.Hay dựa vào những từ gợi ý để hoàn thành đoạn thoại sau

A: Could you give me some information ,please?

B: Yes,of course .What/would/like/know?->What would you like to know?

(1)

A:Is it possible to fly to Scotland?

B:Yes,there are several flights a day.

A: How/it/cost?->How much does it cost?

(2)

B: About $100, depending on the time of the flight.

A: Are there any other ways of getting there?

B:Oh,yes.You can go /train/or/coach.->You can go by train or by coach

(3)

A:How long /it/take/get there/coach?(4)How long does it take to get there by coach?

B:By coach ?About twelve hours

A:it/be/faster/train?->Will it be faster than train?

(5)

B:Yes,it's much faster

A:Ok,I'll take the train then

không có a vì gttđ >-1

1/ what time the concert will=> will the concert start ?

2/ i see=> will see you at 8 tomorrow morning. don't be late

3/how long will the play last ? till=> At nine or half and past nine

4/ what is your date of birth ? november twentieth=> the twentieth

5/are=> Do you like your school ? yes, it's very beautiful

6/don't worry. you will have lot => lots of friends

7/i live with my parents on=> at 88 tran hung dao street

8/how old will he be in=> at his next birthday ?

9/i => My classes start at seven o'clock

10/this is a girl nice=> nice girl

1.how long does she job a day?

2.how far is it from your school to the post office?

3.how much is the dictionary?

4.what would you like?

5.who is tim?

6.why do you need a phone card?

7.what does mr . viet do?

8.where does lan often do in her free time?

9.what is your mother doing in the kitchen at the moment

10.what does nam like playing after school?