Báo cáo

Xét tam giác ABD và tam giác ADC ta có:

AD chung

AB=AC(tam giác ABC cân tại A)

Góc BAD=góc DAC(AD là phân giác của góc A)

=>Tam giác ABD=tam giác ADC(c.g.c)

=>BD=DC(cặp cạnh tương ứng)

Vì BD=DC(cmt)

=>D là trung điểm của BC

1. If students plant trees in the school yard, their school will be a greener place.

2.If he doesn't get up early,he will miss the first bus

3.Don't playgames too much

D

D

D

B

She wanted to know if I had been here the day before.

Duc asked Trang if she knew NASA had found two new planets

\(\dfrac{6}{7}+\dfrac{5}{8}=\dfrac{48}{56}+\dfrac{35}{56}=\dfrac{83}{56}\\\dfrac{36}{12}+\dfrac{5}{3}=\dfrac{36}{12}+\dfrac{20}{12} =\dfrac{56}{12}=\dfrac{14}{3}\)