Bài1Chứng minh a )Adfrac{m}{n}1+dfrac{1}{2}+dfrac{1}{3}+...+dfrac{1}{10}notin N
Bdfrac{1}{2}+dfrac{1}{3}+dfrac{1}{4}+...+dfrac{1}{81}notin N
b) Cho dfrac{m}{n}1+dfrac{1}{2}+dfrac{1}{3}+...+dfrac{1}{10}
Chứng minh m ⋮ 11
Đọc tiếp
Bài1Chứng minh a )A=\(\dfrac{m}{n}=1+\dfrac{1}{2}+\dfrac{1}{3}+...+\dfrac{1}{10}\notin N\)
B=\(\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{81}\notin N\)
b) Cho \(\dfrac{m}{n}=1+\dfrac{1}{2}+\dfrac{1}{3}+...+\dfrac{1}{10}\)
Chứng minh m \(⋮\) 11
