Question

[Nguyễn Thùy Linh]

Bài 1:Cho A=1/4+1/5+1/6+1/7+1/8+....1/15 hãy chứng minh A<2

Answer 1

[NGUYEN MINH CHAU]

• A=1/4+1/5+1/6+...+1/15<1/15+1/15+1/15+...+1/15=15/15=1
• ma 1<2
• =>1/4+1/5+1/6+...+1/15<2
•