Bài 4: khu đô thị mới của một thành phố được xây dựng trên khu đất hình chữ nhật có diện tích 30ha và chiều rộng là 500m. Nay người ta muốn mở rộng khu đô thị thành hình vuông có cạnh bằng chiều dài khu đất ban đầu. Hỏi phần diện tích mở rộng thêm của khu đô thị là bao nhiêu héc-ta?

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I. Turn these sentences into active voice. 1.The Imperial Academy was constructed under Emperor Ly Thanh Tong. ___________________________________________________________________________ 2.The Temple of Literature was founded in 1070. ___________________________________________________________________________ 3.Khue Van pavilion is regarded as the symbol of Ha Noi. ___________________________________________________________________________ 4.Lots of souvenirs inside the Temple of Literature are sold. ___________________________________________________________________________ 5.Meals are cooked by my sister every day. ___________________________________________________________________________ 6.The floor was cleaned by my mother yesterday. ___________________________________________________________________________ 7.Ten emails are written for 2 hours by my friend every day. ___________________________________________________________________________ 8.Our house is painted by my father whenever Tet comes. ___________________________________________________________________________ 9.Groceries were bought at the supermarket by my sister yesterday. ___________________________________________________________________________ 10.A pencil is used to draw beautiful pictures by my brother. ___________________________________________________________________________ 11.All their work was finished last night. ___________________________________________________________________________ 12.Every morning, many morning exercises are done by me. ___________________________________________________________________________ 13.Trees and flowers are planted in the garden by us every summer. ___________________________________________________________________________