Cho mệnh đề chứa biến P(x) = {x ∈ ℤ : |x² – 2x – 3| = x² + |2x + 3|}. Trong đoạn [-2020; 2021] có bao nhiêu giá trị của x để mệnh đề chứa biến P(x) là mệnh đề đúng?

Lithium có hai đồng vị bền trong tự nhiên, trong đó đồng vị $^6_3Li$ chiếm 7,5% tổng số nguyên tử. Biết nguyên tử khối trung bình của lithium là 6,925, số khối của đồng vị còn lại là

Cho hình chóp S.ABCD có đáy là hình bình hành tâm O. Gọi M là trung điểm của SC. Giao điểm I của AM và (SBD) là:  

Mệnh đề phủ định của "$\forall x\in \mathbb{R}: \, x^2>x+7$" là

Qúa trình xử lí thông tin gồm bao nhiêu bước?

Cho bất phương trình \(2(2x - 3y) - (2x - y + 5) > x - 3y + 1\). Điểm nào thuộc miền nghiệm của hệ đã cho?

Mark the letter A, B, C or D on your answer sheet to indicate the correct option that best fits each of the numbered blanks from 22 to 26.

WAYS TO IMPROVE YOUR MEMORY

A good memory is often seen as something that comes naturally, and a bad memory as something that cannot be changed, but actually (22) ____________ to improve your memory.

We all remember the things we are interested in and forget the ones that bore us. This no doubt explains the reason why schoolboys remember football results (23) __________ but struggle with dates from their history lessons! Take an active interest in what you want to remember, and (24) ____________ . One way to make yourself more interested is to ask questions — the more the better!

Physical exercise is also important for your memory, because it increases (25) _______________ and sends more oxygen to your brain, and that makes your memory work better. Exercise also reduces stress, (26) _________________.

The old saying that ― eating fish makes you brainy may be true after all. Scientists have discovered that the fats found in fish like tuna, sardines and salmon — as well as in olive oil — help to improve the memory. Vitamin-rich fruits such as oranges, strawberries and red grapes are all good brain food, too.

Đơn vị của điện thế là vôn (V). 1V bằng

Công suất định mức của động cơ là gì?

Mark the letter A, B, C, or D on your answer sheet to indicate the correct option that best fits each of the numbered blanks from 18 to 23.

       Music brings many benefits to our lives, especially when we learn something new. Firstly, it makes learning more enjoyable. When we listen to music while studying, it can help us feel relaxed and happy. (18) _______. For example, if you are learning a new language, listening to songs in that language can help you understand and remember words better.

       Secondly, music helps us focus. (19) _______, our mind becomes less distracted. We can concentrate better on our tasks, whether it’s reading, writing, or solving problems. This is because music has a special way of grabbing our attention and (20) _______.

       Finally, music connects us with other cultures. Through music, we can learn about the traditions, feelings, and (21) _______. It’s like traveling to new places without leaving (22) _______. We can hear different instruments, rhythms, and voices that tell us about the rich diversity of our world.

       In summary, music is not just about entertainment. It helps us learn better, stay focused, and (23) _______. It’s a powerful tool that can make our learning journey more exciting and rewarding.

Read the following advertisement 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 1 to 6.

Discover the Future of Tech with SmartGadgets

• Experience (1)___________like never before with our smartphones that redefine connectivity.

• Our (2)_____________ will enhance your daily life and keep you ahead of the curve.

• Join thousands of customers (3)________with their purchases and enjoy unparalleled performance.

• Show the features (4)_________ your customers that truly set you apart from the competition.

• Don’t miss out on this (5)_______-in-a-lifetime opportunity to upgrade your tech.

• Start (6)_________the benefits of advanced technology today, or wait for the future to catch up!

With SmartGadgets, you're not just purchasing a product; you're investing in a lifestyle. Explore our collection now!

Đặc điểm của bệnh Newcastle là

Trong ngôn ngữ Python, tên nào là từ khoá?

Nghệ thuật của bài thơ Mùa xuân chín là gì?

Read the following passage about women in the workplace 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.

Marcel Bich, a French manufacturer of traditional ink pens, was the man (18) ______. Bich was surprised by the poor quality and high price of the ballpoint pens available at the time. However, he realised that the ballpoint pen was a well-established invention, (19) ______ that would succeed in the market.

"Bich approached the Biro brothers and asked for permission to use their original invention in one of his pens. In return, he offered to pay them for each pen he sold. (20) ______, he used a microscope to examine them closely."

By 1950, he was ready to introduce his new design: a plastic pen with a transparent barrel that wrote smoothly, didn’t leak, and cost only a few cents. The new ballpoint pen (21) ______. The public liked it immediately, and today it is as common as the pencil.

Bich's success allowed him to establish Société Bic, which expanded worldwide. (22) ______, producing not only pens but also lighters, razors, and even mobile phones.

Công của lực điện trường dịch chuyển một điện tích 5.10^-6 C dọc theo chiều một đường sức trong một điện trường đều 1000 V/m trên quãng đường dài 0,5m là

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.

EXPLORE THE POWER OF SOCIAL MEDIA!

Start your social media journey today and discover a world of endless possibilities

Connect, Share, and Learn!

Social media has changed the way we (7)______, learn, and share ideas. It allows us to stay in touch with friends, (8)______ new topics, and share our daily moments with the world. Whether you love posting pictures or watching videos, social media is a space for everyone.

What Makes Social Media Great?

• Stay Connected – (9)______ with family and friends, no matter how far they are.
• Learn Something New – Follow pages about hobbies, news, or (10)______ skills you want to improve.
• Express Yourself – Share your thoughts, photos, and videos with (11)______ users around the world.

Social Media for Everyone!

Social media is (12)______ for fun but it’s also a tool for learning, building friendships, and sharing your voice. Join a community today and see how it can make your life more exciting and connected!