21b 22a 23d 24c 25b

chắc ko

Một số câu ca dao, tục ngữ, thơ hay về Ninh bình :
1. Ta đi ta nhớ quê nhà
Nhớ rượu Mã Kích, nhớ gà đồi quê ta.
2. Hồng Gai có núi Bài Thơ
Có hang Đầu Gỗ, có chùa Long Tiên.
3. Đồn Cẩm Phả sơn hà bát ngát Huyện Hoành Bồ đồi cát mênh mông.

1. John speaks English more fluently than me.

=> I can't speak English fluently like John

2. They are going to build a hospital near my house.

=> A hospital is about to be built near my house

People who love camping often think of tents as their second home. Modern tents are both lighter (1) and more comfortable than (2) the old canvas tents which our parents used. They are often fitted with extra space which can be used as kitchens or for storing equipment in bad weather. Some tents are big (3) enough for bicycles to be stored inside, (4) others will only take a couple of rucksacks. Tents are generally classified by the number of people they will sleep in relative comfort. They range (5) from small –occupants to six-person tent (6) that looks like a luxury home.

1 They will send him abroad to study. He will have to go abroad to study

2 I can't give you a ride because I don't have a motorbike If I had a motorbike, I would have given you a ride

a). Ta có: Góc xOy = 90 độ. Vì hai trục Ox và Oy vuông góc với nhau
 Góc xOm = 120 độ
Tổng góc bên trong của một tam giác:
 góc mOy + góc xOy + góc xOm = 360 độ 
=> Góc mOy = 150 độ
Vì tia Om không trùng với tia Ox và tia Oy
=> Góc xOm = 120 độ

b).Ta có : OA+OA=AB
=> 6+3=AB
=> AB=6cm
c) Vì C là trung điểm của AB 
=> AC = CB = AB/2 = 4,5cm.
Nên AC=4,5cm T
Ta có : OC=4,5-3
           OC=1,5cm