Chung to 1< 1/5 + 1/6 +...+1/16 + 1/17<2
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Chung to 1< 1/5 + 1/6 +...+ 1/16 + 1/17<2
Chung to 1< 1/5 + 1/6 +...+ 1/16 + 1/17<2
chung to rang 1/5+1/6+1/7=...+1/16+1/17<2
Chung minh rang 1/15+1/16+1/17+1/18+.....+1/44 > 5/6
Chung minh rang
1 be hon 1/5+1/6+.....+1/16+1/17 be hon 2
vì các phân số có mẫu lớn hơn tử thì bé hơn 1 nên chúng bé hơn 2
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Cho B=1/5+1/6+1/7+...+1/17 .Chung to rang B<2
Chunh to 1< 1/5 + 1/6 + ....+ 1/16 + 1/17<2
Cho S=1/2+1/6+1/7+1/8+...............1/16+1/17.Hãy chung tỏ S<2
15 tháng 3 2022 lúc 12:52
d/5/16-5/24
e/-24/17-[-7/17-1/16]
f/-11/6+2/5+-1/6
d: \(\dfrac{5}{16}-\dfrac{5}{24}=\dfrac{5\cdot3}{48}-\dfrac{5\cdot2}{48}=\dfrac{5}{48}\)
e: \(-\dfrac{24}{17}-\left(-\dfrac{7}{17}-\dfrac{1}{16}\right)\)
\(=-\dfrac{24}{17}+\dfrac{7}{17}+\dfrac{1}{16}=-1+\dfrac{1}{16}\)
\(=-\dfrac{15}{16}\)
f: \(\dfrac{-11}{6}+\dfrac{2}{5}+\dfrac{-1}{6}\)
\(=\left(-\dfrac{11}{6}-\dfrac{1}{6}\right)+\dfrac{2}{5}\)
\(=-2+\dfrac{2}{5}=\dfrac{-8}{5}\)
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