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Cho tam giác ABC cân tại A có góc A=100 độ có I là giao điểm 3 phân giác trong của tam giác ABC.Trên tia BA lấy D sao cho BD=BC.Đường thẳng BI cắt AC tại E,DE cắt BC tại F.Chứng minh IF vuông góc AB. Giải giúp ik

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Phân tích đa thức sau thành nhân tử X^3-y^3-z^3-3xyz (X+y-z)^3-x^3-y^3+z^3

Exercise 1: Teenagers nowadays are growing up more slowly A new study says today's teenagers are growing up more slowly than previous generations. Research from San Diego State University looked at data on teenage behaviour from the past 40 years, between 1976 and 2016. It looked at surveys on 8 million teens from seven different countries. Researchers said that compared to teenagers from the 70s, 80s and 90s, today's teens, "are taking longer to take part in both the pleasures and the responsibilities of adulthood". Professor Jean Twenge said: "The whole developmental pathway has slowed down." She said today's 18-year-olds are living more like 15-year-olds used to live. She said teenagers are taking far fewer risks than they did before. The researchers said today's teenagers are taking longer to do things their parents and grandparents did. They are older when they go on their first date, less likely to have a part-time job, and are less likely to drive. Professor Twenge said this is a "slow life strategy". Researchers also found that more teenagers are spending longer living with their parents instead of renting their own room or apartment. One of the reasons for these behaviours is how much time teenagers spend online. The Internet is keeping teens on social media, looking at videos or playing games instead of living in the "real world". Another reason was parents who try and do too much for their children and protect them too much. 1. Which period of time did researchers examine data from? A. The past four centuries B. The past four decades C. The past40 months D. The pastfour years How many teenagers were inspected? A. 8 000 000 B. 8 000 C. 8 000000 000 D. 800 2. Compared to previous generations, how are teenagers nowadays? A. They are living more dangerously. C. They are healthier. B. They don’t take as many risks. D. They don’t study as hard. 3. According to the article, which of the following statements is true? A. Teenagers are now more independent than their parents were at that age. B. Teenagers hate growing up. C. Nowadays, fewer teenagers drive by themselves. D. Teenagers now start to go on dates at a younger age than their parents did. 4. According to the article, which of the following statements is NOT true? A. Teenagers are taking longer to enjoy the pleasures of adulthood. B. Modern teenagers work more than their parents and grandparents used to. C. Modern 18 year-olds are about as grown-up as 15 year-olds from previous generations. D. Teenagers are now living with a “slow life strategy”. 5. Which of these online activities was not mentioned in the article? A. Taking online courses B. Playing video games C. Using social media D. Watching videos 6. What could be a way to help teenagers become more mature? A. Their parents should encourage them to work out more often. B. Their parents should not allow them to use the Internet at all. C. Their parents should force them to move out as soon as they turn 18. D. Their parents should not be overprotective.

Mb giải thích cho mình b5 cái đoạn a+c=-b ạ ,hứa cho ctlhn

(HÌNH VẼ) Chứng minh Tam Giác DJK vuông cân tại J nếu : 1) AJ=1/4AC . K là trung điểm CB 2) O là giao điểm AC , BD và AJ/AO=BK/BC

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giúp em câu 3 với ạ, em hứa vote 5*