câu 2 

         -Người đi xe đạp cần phải

em cực kì cực kì thích môn tiếng anh luôn

M=1/1.2+2/2.3+...+1/49.50 với 1

 câu 5  Nước biển và đại dương có độ muối trung bình 35%o. - Nguyên nhân: Nước sông hòa tan các loại muối từ đất, đá trong lục địa đưa ra.

I wish I would have a big penthouse in a big city. It will be a modern and comfortable near my working place. My house has two floors with 3 bedrooms, a living room, a kitchen and an entertainment room. All equipment in my house will be high-tech to serve my daily life in the best way. In my bedroom, it will painted a bright color tone to make a room more spacious. I will hang on the wall a few beautiful paintings and photos. There is a dressing room where I display my collection clothes and shoes. An entertainment room will be well-equipped with a smart TV and a modern karaoke system. Especially, on the second floor, there will be a large balcony where my family set up a party and have a barbecue with our lovely friends at the weekends. My future house must be beautiful and I will make it become true.