a: Xét ΔBAC có 

D là trung điểm của AB

M là trung điểm của AC

Do đó: DM là đường trung bình của ΔABC

Suy ra: DM//BC và \(DM=\dfrac{BC}{2}=3.5\left(cm\right)\)

đọc đề mà quạo lun ă:>

dễ mà tự lm ik:333

Ủa giúp cái gì zạ :>

Giúp ?

trắc nghiệm hả tớ sẵn sàng giúp

1.Yes, they do

2..Yes, it is

3.People buy fruits and flowers from the market and decorate their house

4.People visit their family and friends

1,C

2,C

3,C

4,A

1,We have learnt E for 4 years

2,It has been 3 years since I last saw her

3,He has not smoked since last year

4,Loan last wrote to you a month ago

5,Mai began singing when she was 7

6,They stopped produced this...toy long time ago

7, It is 2 hours since we watched TV

8,The last time I heard him was August

9,The last time Mr Brown taught E at this school was on January 10^th