giúp e với ạ. combo luôn cho gt nhaaa
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Bài 2:
a: Xét tứ giác ABOC có
\(\widehat{ABO}+\widehat{ACO}=180^0\)
Do đó: ABOC là tứ giác nội tiếp

Bài 1:
a: Xét ΔAMB và ΔAMC có
AM chung
AB=AC
BM=CM
Do đó: ΔABM=ΔACM

Ta sẽ chứng minh bằng biến đổi tương đương như sau :
Ta có : \(\sqrt{a+b}< \sqrt{a}+\sqrt{b}\left(1\right)\Leftrightarrow\left(\sqrt{a+b}\right)^2< \left(\sqrt{a}+\sqrt{b}\right)^2\Leftrightarrow a+b< a+b+2\sqrt{ab}\)
\(\Leftrightarrow2\sqrt{ab}>0\Leftrightarrow\sqrt{ab}>0\) (luôn đúng)
Vì bất đẳng thức cuối luôn đúng nên bất đẳng thức (1) được chứng minh.

1:
Đặt AB=x; CM=y
Theo đề, ta có: 4x-4y=28 và x^2-y^2=119
=>x-y=7 và x^2-y^2=119
=>x=y+7 và y^2+14y+49-y^2=119
=>y=5
=>S=5^2=25cm2


1 a / leather / handbag / black
-> It's a black leather handbag.
2 Japanese / a / car / new / red / big / luxurious
-> It is a luxious big new red Japanese car.
3 Grey / long / bread / a
-> It's a long grey bread.
4 flowers / red / small
-> They are small red flowers.
5 beautiful / she / lips / with / full / red / is
-> She is beautiful with full red lips.
6 expensive / house beautiful / a / large
-> It's a expensive large beautiful house.
7 house / a / modern / big / brick
-> It's a big modern brick house.
8 American / a / plane / new . / blue / big / long
-> It's a new big long blue American plane.
9 table / a / round / big / white / plas
-> It's a big round white plas table.
10 fair / hair / she / long / curly / has
-> She has fair long curly hair.
Chúc em học tốt!!!
1 a / leather / handbag / black
-> It's a black leather handbag.
2 Japanese / a / car / new / red / big / luxurious
-> It is a luxious big new red Japanese car.
3 Grey / long / bread / a
-> It's a long grey bread.
4 flowers / red / small
-> They are small red flowers.
5 beautiful / she / lips / with / full / red / is
-> She is beautiful with full red lips.
6 expensive / house beautiful / a / large
-> It's a expensive large beautiful house.
7 house / a / modern / big / brick
-> It's a big modern brick house.
8 American / a / plane / new . / blue / big / long
-> It's a new big long blue American plane.
9 table / a / round / big / white / plas
-> It's a big round white plas table.
10 fair / hair / she / long / curly / has
-> She has fair long curly hair.