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Phân tích thành nhân tử: a) x2 – 3 ; b) x2 – 6 c) x2 + 2√3 x + 3 ; d) x2 - 2√5 x + 5
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mk chỉ cần đáp án nếu ai gt đc thì càng tốt m sẽ cho ctlhn + 5 sao và 30 điểm One of the most obvious negative aspects of social networking is losing face- to-face contact with other people. Teens are sitting around with their phone in their hands all day long, tapping messages onto screens instead of communicating with real people. Many teenagers feel more comfortable with virtual friends than with real ones. The majority think that it is easier to chat on the Internet because they lack communication skills. It is also true that parents often have no knowledge about what their kids do with their phones or computer. Crosby says that, "While kids are plugged in to social media, only about 40% of parents are involved themselves." And because parents don't know the full picture, they also don't know how to deal with a teenager's potential overuse of social media and might not even be aware that a problem exists. Therefore, social networking can be much more immediately engaging with the teenager's life than parents are, and this fact makes virtual communication feels more "real" than face-to-face communication. 41.What is the main idea of the passage? A.Parents should use social networks more to understand their children. B.Students are using social networks too much. C. Social networking brings negative effects to student’s face-to-face communication. D. Virtual life is easier than real life. 42.What do most teenagers think about chatting on the Internet? A. Chatting on the Internet is easier than talking with real people. B. Chatting on the Internet is more difficult than talking with real people. C. Chatting on the Internet is funnier than talking with real people. D. Chatting on the Internet is more boring than talking with real people. 43. The percentage of 40% refers to A. The number of parents who let their children use social media. B. The number of parents who do not want their children to use media. C. The number of parents who use social media.

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