Cặp số nào sau đây không thuộc nghiệm của bất phương trình x−4y+5>0?
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
- $(0; 0)$: $0 - 4(0) + 5 = 5 > 0$. Vậy $(0; 0)$ là nghiệm.
- $(-5; 0)$: $-5 - 4(0) + 5 = 0$. Vậy $(-5; 0)$ không là nghiệm.
- $(2; 1)$: $2 - 4(1) + 5 = 3 > 0$. Vậy $(2; 1)$ là nghiệm.
- $(1; -3)$: $1 - 4(-3) + 5 = 1 + 12 + 5 = 18 > 0$. Vậy $(1; -3)$ là nghiệm.
Câu hỏi liên quan
Cho hàm số \(y=f(x)\) có bảng biến thiên như sau:
Hỏi hàm số đã cho đồng biến trên khoảng nào dưới đây?
Tính theo giờ địa phương, nếu ở kinh tuyến 1050Đ là 12 giờ thì ở kinh tuyến 1040Đ là mấy giờ?
Bất phương trình nào sau đây là bất phương trình bậc nhất hai ẩn?
Cho hình hộp ABCD.A’B’C’D’ có \(AA' \bot \left( {ABCD} \right)\). Khẳng định nào dưới đây đúng?
Hàm số y=x4−4x3−5 nhận điểm
Read the following passage about fitness trends and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.
FITNESS TRENDS
[I] Reformer Pilates is an advanced and more intense variation of traditional Pilates. [II] Since this type of equipment isn’t something you would typically have at home, you’ll need to visit a specialized Pilates center to try it. [III] While it might look easy at first, don’t be fooled - by the end of the session, your thighs will be burning, and you might struggle to walk up or down stairs for a few days afterward. [IV] This workout pushes your body to its limits, providing a more challenging experience than standard Pilates, and many find it an effective way to build both strength and flexibility.
Trampolining is another popular fitness trend, and although it may seem like child's play, it’s actually a highly effective workout. Jumping up and down on a trampoline can leave you feeling exhausted after just a few minutes. Surprisingly, it’s even better for heart health than running, while also improving coordination and helping to reduce stress levels. Trampolining is gaining widespread popularity, with new centers popping up that feature as many as 150 trampolines. These facilities offer options for everyone: you can enjoy 'freejumping, where you bounce without an instructor, or pay for professional lessons to learn the best techniques and get the most out of your workout. Many people are discovering that trampolining combines fun and fitness in a way that makes staying active much more enjoyable.
If you're someone who is typically active but feeling down or emotionally drained, Dynamic Running Therapy might be just what the doctor ordered. This trend involves running with a therapist, combining the benefits of physical exercise with talk therapy. Though these sessions are often more expensive than typical therapy sessions because of the professional fees, they offer significant advantages. Running while talking helps distract you from any discomfort, allowing you to cover longer distances, and creates a relaxed, open environment that can make it easier to talk compared to the usual therapist’s office setting.
Which of the following best summarizes paragraph 3?
PHẦN II. Câu trắc nghiệm đúng sai. Thí sinh trả lời từ câu 1 đến câu 4. Trong mỗi ý a), b), c), d) ở mỗi câu, thí sinh chọn đúng hoặc sai.
Cho hàm số
.
a) Hàm số có tập xác định là
.
b) Hàm số đã cho đồng biến trên
.
c) Giá trị cực tiểu của hàm số bằng 8.
d)
đạt được khi
.
Read the following passage about food addiction and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.
Few people would disagree that one of the world's most popular dishes is pizza. Twenty-two-year-old Zack certainly wouldn't. He would eat a variety of pizza-based items, including homemade pizza, precooked microwave pizza, and even pizza leftovers from the night before. He was consuming 800kg of pizza a year. As a child, Zack had eaten a wide variety of food. But he became addicted to pizza when he started secondary school. American school meals have often been criticised for the large amount of fast food present on the menu, and pizza is the star dish. Zack even spent all his pocket money on slices of pizza.
Naturally, Zack's family worried about his high-calorie, low-vitamin diet. So did Zack. In an attempt to break his addiction, Zack agreed to appear on a TV programme called Freaky Eaters. Its aim was to encourage food addicts to beat their addictions with the help of a psychologist and nutritionist. It wasn't easy. He had to eat a fish dish, while his brother sat in front of him enjoying... a pizza! However, Zack met the challenge and has never eaten pizza again.
Seventeen-year-old Stacy Irvine's friends visit her and discover that she has been rewarded thousands of free toys from fast food restaurants as a regular customer. Stacy's mother often gave her two-year-old girl a portion of fried chicken in a McDonald's restaurant. [I] Since then, Stacy has refused to eat anything else except for pieces of fried chicken, and as a result, her diet has created serious health. She has been warned that if she doesn't change her diet, she will die. [II] Stacy once collapsed due to lack of vitamins and nutrients and needed to be hospitalised. [III] She insisted that Stacy adopt a healthier lifestyle. However, worryingly, Stacy's mother said that while Stacy was beginning to understand the seriousness of her situation, she couldn't eat anything else but chicken nuggets. [IV]
Twenty-year-old Hanna Little was keen on chips. The only thing that Hanna consumed for fifteen years was one plate of chips after another. Not surprisingly, a diet that contained few nutrients and an excess of fat and carbohydrates could only have negative consequences. And it did because not only did Hanna develop health problems, but she also had to leave her job after collapsing at work. At five, Hanna became addicted to chips and refused to eat fruits and vegetables despite her mother's efforts. Hanna says that she was terrified of tasting the flavour of different types of food and she would feel anxious just at the idea of doing it. Parties, picnics and barbecues with friends and family used to be a nightmare. Furthermore, Hanna was soon seen as 'odd' by her friends' parents.
It wasn't until the age of sixteen that Hanna realised she had Selective Eating Disorder (SED). Despite this new knowledge, no solution was found. It wasn't until she lost her job before she started eating normally. Hanna sought therapy from psychologist Felix Economakis, who used hypnosis, a treatment that none of the doctors that she had seen before had mentioned, to get her to eat fruit after one one-hour session, and since then she has been willing to eat anything.... including chips!
(Adapted from Friends Global)
Where in paragraph 3 does the following sentence best fit?
The doctor who treated her said she had never seen such an extreme case of food addiction.
Ngành nào dưới đây có vai trò trong bảo vệ đa dạng sinh học?
Trong một khu rừng nhiệt đới có các cấp độ tổ chức nào dưới đây?
Có bao nhiêu số nguyên thuộc khoảng \(\left( { - 2\,022\,;\,\,2\,022} \right)\) là nghiệm của bất phương trình \({3^x} \cdot {2^{{x^2}}} > 1\)?
Cho phương trình \(x^{2}-2 m|x|+9-m=0\). Tìm \(m\) để phương trình có 3 nghiệm phân biệt?
Chọn câu phát biểu sai?
1. Trong nguyên tử luôn có số proton bằng số elctron bằng điện tích hạt nhân
2. Tổng số proton và số electron trong một hạt nhân gọi là số khối
3. Số khối A là khối lượng tuyệt đối của nguyên tử
4. Đồng vị của cùng một nguyên tố hóa học là những nguyên tử có cùng số hạt proton nhưng khác nhau số hạt neutron.
Truyện về các vị thần sáng tạo thế giới thuộc thể loại nào?
Nhà thơ nào là bạn thân của tác giả Đỗ Phủ?
Cho hàm số . Giá trị nhỏ nhất của hàm số trên bằng?
Để quan sát lục lạp trong tế bào thực vật, người ta thường sử dụng mẫu vật nào dưới đây?
Một người chia thời lượng (đơn vị: giây) thực hiện các cuộc gọi điện thoại của mình trong một tuần thành sáu nhóm và lập bảng tần số ghép nhóm như sau.
\(\begin{array}{|c|c|}\hline \text { Nhóm } & \text { Tần số } \\\hline[0 ; 30) & 10 \\\hline[30 ; 60) & 11 \\\hline[60 ; 90) & 8 \\\hline[90 ; 120) & 6 \\\hline[120 ; 150) & 4 \\\hline[150 ; 180) & 1 \\\hline\end{array}\)
Tứ phân vị thứ ba \({{Q}_{3}}\) (đơn vị: giây) của mẫu số liệu ghép nhóm trên bằng
Mục đích của chạy thận nhân tạo là gì?
Read the following passage about reading skill 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 18 to 22
Reading is an essential skill that enhances our cognitive abilities in many ways. Firstly, it improves our language skills. When we read, we learn new words and understand how they are used in context, ___(18)___. This helps in expanding our vocabulary and improving our communication skills. Secondly, reading boosts our imagination and creativity. ___(19)___, it takes us to different worlds and situations we might not experience in real life. This stimulates our creativity and helps us think outside the box. Thirdly, regular reading enhances our concentration and focus. It requires us to pay attention to details and follow complex narratives, ___(20)___. Additionally, reading provides us with knowledge about various subjects and cultures. It allows us to gain insights into ___(21)___. This broadens our perspective and helps us become more empathetic and understanding. Finally, reading is a great way to relax and de-stress. It can be a form of escapism, where we can lose ourselves in a story and forget about our daily worries, which provides a much-needed break for us. In conclusion, reading is not just a leisure activity. It plays a significant role in our cognitive development, helping us to ___(22)___. Therefore, it's important to cultivate a habit of reading from a young age.