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a. It's hers. 

b. ok , you  go right to the art room  

c. Thay were planted trees last Sunday.

Last summer, I and family went to Ha Long Bay. It was sunny and very hot. My sister and I went swimming and windsurfing. Then, we went to souvenir shop because we bought a lot of gifts for our friends. Next, we went to restaurant for lunch. We ate seafood.The food was delicous,but were very expensive.Finally, we took a lo of photos and went to home and took a taxi.After my trip, we very happy because we had a great time get together. I hope to exprience ore wonderful trips in the upcoming summer vacation.

Last summer, I and family went to Ha Long Bay. It was sunny and very hot. My sister and I went swimming and windsurfing. Then, we went to souvenir shop because we bought a lot of gifts for our friends. Next, we went to restaurant for lunch. We ate seafood.The food was delicous,but were very expensive.Finally, we took a lo of photos and went to home and took a taxi.After my trip, we very happy because we had a great time get together. I hope to exprience ore wonderful trips in the upcoming summer vacation.

Giá bán của chiếc máy tính sau khi giảm  giá là: 15 750 000 x 10% =1 575 000 ( đồng) 

                                                                                                             Đ/s: 1 575 000 đồng 

a) 0,125 x 7,21 x 80                                    b) 7,3 x 0,001 + 92,7 x 0,001 

= 7,21 x ( 0,125 x 80 )                                 = 0,001 x ( 7,3 + 92,7 ) 

= 7,21 x 200                                                = 0,001 x 100

= 1442                                                         = 0,1

a) 49,52    

b) 303,47 

c) 14,46 

d) 7,2

a) 0,63 tấn 

b) 0,721 m 

c) 9,07 km²  

d) 0,414 l

ta có thể lập được 6 số thập phân có ba chữ số khác nhau và có hai chữ số ở phần thập phân.Đó là những số:1,79;1,97;7,91;7,19;9,71;9,17.

Nửa chu vi là:130:2=65(m) 

Chiều rộng là:65:(2+3)x2=26(m) 

Chiều dài là:65-26=39(m)

                            Đáp số : Chiều rộng : 26 m 

                                            Chiều dài:39 m