Câu hỏi: chung minh rang 2 day so nay la hop so a,1+2^7+3^11+5^13+7^17+11^19 b,21^123+23^124+25^125
Câu hỏi: chung minh rang 2 day so nay la hop so a,1+2^7+3^11+5^13+7^17+11^19
b,21^123+23^124+25^125
Cho B=1/4+1/5+1/6+...+1/19.Hay chung to rang B>1
chứng minh rằng B = 1/5+1/6+1/7+...+1/19 < 11/6
Chứng minh rằng B = 1/5+1/6+1/7+...+1/19 < 11/6
cho B=1/4+1/5+1/6+...+1/19. Chung to rang B>1
MINH CAN GAP
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chung minh rang :1/101+1/102+1/103+...+1/400<11/6
Cho B=1/5+1/6+1/7+...+1/17 .Chung to rang B<2
chung to rang B=1/2^2+1/3^2+1/4^2+1/5^2+1/6^2+1/7^2+1/8^2<1
ai lam duoc minh tick cho