	Phạm Văn Bắc \| Chat Online
	12/09/2024 16:16:51
	Toán học - Lớp 12 \| Toán học \| Lớp 12

Chứng minh \[B = \frac{1}{{{2^2}}} + \frac{1}{{{3^2}}} + \frac{1}{{{4^2}}} + \frac{1}{{{5^2}}} + \frac{1}{{{6^2}}} + \frac{1}{{{7^2}}} + \frac{1}{{{8^2}}} < 1\].

Chứng minh \[B = \frac{1}{{{2^2}}} + \frac{1}{{{3^2}}} + \frac{1}{{{4^2}}} + \frac{1}{{{5^2}}} + \frac{1}{{{6^2}}} + \frac{1}{{{7^2}}} + \frac{1}{{{8^2}}} < 1\].