a) Xét ΔABC và Δ ABD có:

AC=AD

BC=BD

AB: cạnh chung

=>ΔABC=ΔABD (c.c.c) (đpcm)

b) Do ΔABC=ΔABD nên góc ACB=góc ADB (2 gcos tương ứng) (đpcm)

c) Do ΔABC=ΔABD nên góc DAB=góc CAB (2 góc tương ứng)

=>AB là tia phân giác của góc DAC (đpcm)

680m

phòng 3

I haven't cut my hair since I left her

Ta có:

x^2=0+0,25

=>x^2=0,25

=>x^2=(0,5)^2

=> x=0,5 hoặc x=-0,5

Bạn nào lm đc bài nào thì giúp mk với

Are you free on Saturday moring? What about taking part in an Exhibition of Modern Art at Art Centre with me this weekend? It is held at 9 a.m this Saturday morning. It will be great if we meet at 8.15 a.m at our school gate. Then we’ll go to the exhibition together.

Write to me soon. Looking forward to seeing you there.

Giúp mk vớiii