Tìm các giá trị của x để biểu thức sau có nghĩa

In many countries, large amounts of foods are wasted. What are the reasons why people waste food? What can be done to reduce the amount of food thrown away (250 words)

XI. Writing an essay (250 words) about the following topic:
Do you agree or disagree with the following statement? Parents are the best teachers. Use specific reasons and examples to support your answer.

XI. Within 250 words, write an essay about the following topic:
“Online learning is not only convenient for students and teachers but also more effective than traditional classroom instruction”. Do you agree or disagree with the statement?
Use specific reasons and examples to support your opinion.

II. Within 250 words, write a letter about the topic:
You are Mai. Last month you went on a short camping holiday. Your Australian pen-friend, Mary, wants to hear about your experience. Write a letter to your pen-friend, describing what you did, saying what you liked or didn’t like about your holiday.
Write your letter. Do not write any postal addresses.

Write an essay around 200 words on how students can make progress in learning English.

Cho a, b, c ≠ 1; a + b + c = 1

Tính P =  b-c/a+bc + c-a/b+ca + a-b/c+ab