# Nhập số tự nhiên n n = int(input("Nhập số tự nhiên n: ")) # Khởi tạo giá trị tổng S S = 0 # Khởi tạo biến i để tính các phân số 1/2^i i = 0 # Dùng vòng lặp while để tính tổng S while i <= n: S += 1 / (2 ** i) i += 1 # Tăng i lên 1 ở mỗi vòng lặp # In ra kết quả print(f"Tổng S là: {S}") Giải thích chương trình:

ĐKXĐ: \(2-x^2\ge0\)

=>\(x^2\le2\)

=>\(-\sqrt2\le x\le\sqrt2\)

Ta có: \(x+\sqrt{2-x^2}+x\cdot\sqrt{2-x^2}=3\)

=>\(x-1+\sqrt{2-x^2}-1+\sqrt{2x^2-x^4}-1=0\)

=>\(\left(x-1\right)+\frac{2-x^2-1}{\sqrt{2-x^2+1}}+\frac{2x^2-x^4-1}{\sqrt{2-x^2}\cdot x+1}=0\)

=>\(\left(x-1\right)-\frac{\left(x-1\right)\left(x+1\right)}{\sqrt{2-x^2}+1}-\frac{\left(x-1\right)^2\cdot\left(x+1\right)^2}{\sqrt{2-x^2}\cdot x+1}=0\)

=>\(\left(x-1\right)\left(1-\frac{x+1}{\sqrt{2-x^2}+1}-\frac{\left(x+1\right)^2\cdot\left(x-1\right)}{\sqrt{2-x^2}\cdot x+1}\right)=0\)

=>x-1=0

=>x=1

1 This is the journalist whose article I read yesterday

2 That is the translator who works for an international communication agency

3 The email which I sent to you this morning is important

4 The book which was recommended by our teacher is about effective communication skills

5 The woman whose speech inspired the entire audience is a famous public speaker

6 The message which you wrote last night was unclear

7 The website which I found while searching for communication tools is a great resource for learning

8 The man whom you saw at the conference is a professional interpreter

9 These are the students whose presentation on nonverbal communication was excellent

10 This is the phone whose features help people with disabilities communicate easily

11 This is a rare opportunity of which you should take advantage to get a better job

12 The boy of whom you made fun of is my cousin

cho mình hỏi ren là j vậy bạn

Nè bạn ơi