so sánh A=1/5+1/13+1/25+1/41+1/61+1/85+1/113 với 1/2
1- ( 1/5 +1/13+1/25+1/41+1/61+1/85+1/113)
So sánh với 1/2.
\(S1=\frac{1}{5}+\frac{1}{13}+\frac{1}{25}+\frac{1}{41}+\frac{1}{61}+\frac{1}{85}+\frac{1}{113}<\frac{1}{2}\)
Chứng minh rằng: 1/3+1/13+1/25+1/41+1/61+1/85+1/113<2
chung minh rang:
1/5+1/13+1/25+1/41+1/61+1/85+1/113<1/2
ai giúp mk bài này với, nhanh lên nha
1/5+1/13+1/25+1/41+1/61+1/85+1/113<1/2
Chứng tỏ rằng
1/5/1/13+1/25+1/41+1/61+1/85+1/113<1/2
Gíup mik nha gấp lắm
Chứng minh rằng
1/5+1/13+1/25+1/41+1/61+1/85+1/113 < 2
Bài này mk ko hiểu.Giải hộ mk vs >.<
chứng tỏ: a, 1/5 + 1/6 + 1/7 + .... + 1/17 < 2
b, 1/5 + 1/13 + 1/25 + 1/41 + 1/61 + 1/85 + 1/113 < 1/2