Cho ba mệnh đề như sau:
A: “ABCD là hình chữ nhật”.
B: “AB = CD”.
C: “ABCD là hình bình hành”.
Mệnh đề nào sau đây sai?
Cho ba mệnh đề như sau:
A: “ABCD là hình chữ nhật”.
B: “AB = CD”.
C: “ABCD là hình bình hành”.
Mệnh đề nào sau đây sai?
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
- A đúng thì B đúng (Hình chữ nhật thì có các cạnh đối bằng nhau)
- A đúng thì C đúng (Hình chữ nhật là một trường hợp đặc biệt của hình bình hành)
- B sai thì C sai (Nếu chỉ có AB = CD thì ABCD chưa chắc là hình bình hành, ví dụ như hình thang cân)
- C đúng thì B sai (Hình bình hành thì chưa chắc AB = CD, nó chỉ đúng khi ABCD là hình thoi, hình vuông hoặc hình chữ nhật)
Câu hỏi liên quan
Ngày 10/10/1911 ở Trung Quốc đã xảy ra sự kiện gì?
Mật khẩu điện thoại của bạn A gồm 3 chữ số tự nhiên khác nhau đôi một, được sắp xếp theo thứ tự tăng dần, số cách chọn mật khẩu đó là:
CHỦ ĐỀ: TRỞ VỀ
(Tham khảo bài văn của chủ đề trong đường link dưới đây ở trang 21)
https://tvsthpt.dlib.vn/app/doc-sach-ebook/d00ddd794efd
Và trả lời câu hỏi sau:
Theo đoạn [2], vợ Tâm muốn về thăm nhà ở quê cùng chồng.
Đúng hay sai?
Ý nào sau đây đúng khi nói về đạo đức kinh doanh?
Read of the following leaflet and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 7 to 12.
Join Our Community Gardening Program
Are you interested in growing your own vegetables? If you’ve tried our workshops, you’ll want to sign up for (7)_________session! In our program, participants (8)_______ to share tips and techniques for successful gardening. Each week, we focus on a different plant variety, providing you with the (9)_______you need for successful harvests.
Our experts will guide you (10)________ the art of sustainable gardening. You'll also receive a starter kit that includes seeds, soil, and tools, making it easier for you to begin your gardening (11)_______. We believe that a (12)_________ of the benefits of gardening include a sense of community and the joy of growing your own food.
Cho định lý sau: “Nếu tam giác có hai góc bằng 45° thì tam giác đó là tam giác vuông cân”.
Cho biết giả thiết, kết luận của định lý trên.
Environmental groups try to prevent farmers from using harmful _______on their crops.
Gan tham gia vào giải độc rất nhiều chất độc và thuốc. Cấu trúc nào sau đây chủ yếu tham gia vào quá trình này và có số lượng phong phú trong các tế bào gan?
Hai ngành kinh tế đóng vai trò chủ đạo ở Hy Lạp và La Mã cổ đại là
Vai trò của hoạt động trao đổi với người sản xuất và người tiêu dùng là gì?
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
When parents name their children, they often take into consideration their own preferences, family traditions, or beliefs. In many European cultures, parents typically select names based on family connections, often honoring grandparents or ancestors. For instance, in Italy, children are commonly named after their grandparents, starting with the father's parents and then the mother's. Similarly, in Eastern Europe, children may be named after their deceased relatives to protect them from harm.
In some Asian countries, the naming process may involve the child's grandfather or a fortune-teller, who chooses a name believed to shape the child's character. Names might be inspired by elements like fire, water, earth, wood, or metal, or they may convey qualities such as beauty, strength, or kindness.
African cultures also have unique naming traditions, such as in Ghana's Akan culture, where a child's name is determined by the day of their birth. Each day has specific names for boys and girls, reflecting characteristics associated with that day. For example, a boy born on Friday might be named Kofi, symbolizing a "wanderer" or "explorer" while a girl born on the same day could be named Afua, also representing a traveler.
No matter where a name originates, it holds significant meaning and reflects the child's cultural heritage. Whether chosen out of preference or dictated by tradition, a child's name is a cherished and respected gift.
What is the main idea of this reading?
Đồ thị hàm số y = tanx đi qua điểm nào dưới đây?
Cho hình tứ diện ABCD có AB, BC, CD đôi một vuông góc. Điểm cách đều bốn điểm A, B, C, D là:
Hợp chất nào sau đây làm đổi màu quỳ tím?
Phát minh đặt cơ sở cho sự phân hạng các nguyên tố hóa học là gì?
1. No matter who we are or where we are from, we only have 24 hours each day to get things done. Some people seem to make the most of their time, using it to achieve their goals and dreams. Others feel that life is passing them by and they aren’t accomplishing anything. If you are in the latter group, it is not too late to turn things around. By implementing a few simple hacks, you can start getting better results very quickly.
2. If you want to become more productive, it pays to learn about the Pareto principle (which is also known as the 80-20 rule). It states that for most tasks, 80 percent of the results we get come from 20 percent of the work we do. For example. 80 percent of the company sales usually come from 20 percent of customers. Therefore, the trick is to focus your efforts on the key 20 percent of actions that truly matter to greatly improve your results.
3. In some cases, people may be busy from morning to night but still seem to get nothing done. In this situation, the problem might be that clear goals haven’t been set. To fix this, set some time aside to list the things you want to achieve in life. Then, select the top three or four that you want to focus on for the next year. Look at your goals every night before bedtime and ask yourself what are the next actions to accomplish each day. Then, promise yourself that you will finish these tasks no matter how busy you get. If possible try completing the tasks first thing in the morning so you are assured of success.
4. Another common mistake regarding productivity is not considering our energy levels. If we try to work around the clock, we will eventually get tired and quit. Everyone needs time to sleep, eat, socialize with friends, and unwind from the stress of the day. To make sure you don’t burn out, be sure to schedule some time for breaks and fun activities into your schedule every day. Finally, no matter how difficult your goals may seem, remember the old saying that “a journey of a thousand miles begins with a single step”.
What is implied in the last sentence of the passage?
Phát biểu nào dưới đây là đúng khi nói về nguyên tắc thứ bậc của các cấp độ tổ chức sống?
Cộng hòa Nam Phi tiếp giáp với các đại dương nào sau đây?
Đoạn trích phản ánh nhận thức và cách lý giải của con người thời cổ đại về điều gì?
Read the following leaflet and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 7 to 12.
EMBRACE DIVERSITY
⮚ In a multicultural world, we encounter different cultures every day. While some may be familiar, (7) _________ can offer entirely new perspectives on life and society. To truly appreciate diversity, we must (8) _________ to people from various backgrounds, engaging with them to learn about their traditions, values, and ways of life.
⮚ A major benefit of living in a multicultural society is the (9) _________ of our daily experiences and personal growth. We are constantly learning from each other. By participating in activities organized by various communities, you can help create understanding (10) _________ people of different backgrounds. This will foster unity and collaboration.
⮚ In a multicultural world, (11) _________ plays a key role in ensuring peace and harmony across cultures, fostering mutual respect and shared values. To make the most of this diversity, it is essential to have (12) _________ of respect for others, as understanding and tolerance go hand in hand with progress.