Các câu hỏi tương tự
Tính K +2011 Biết
1+(1+2)+(1+2+3)+....+(1+2+3+4+...+2012)
2012*1+2011*2+....+1*2012
Biết p/s đó bằng K
A=[2012+2011/2+2010/3+2009/4+...1/2012]:[1/2+1/3+1/4+...+1/2012+1/2013]
HOI A CHIA 3 DU BAO NHIEU ?
\(choA=\frac{2012+\frac{2011}{2}+\frac{2010}{3}+\frac{2009}{4}+...+\frac{1}{2012}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2012}+\frac{1}{2013}}.hỏiAchia3dưbaonhiêu\)
Cho A = 1/2×2+1/3×3+1/4×4+...+1/2012×2012
a)so sánh A với 1
b)so sánh A với 3/4
A có chia hết cho 3 không?
\(A=\frac{2012+\frac{2011}{2}+\frac{2010}{3}+\frac{2009}{4}+...+\frac{1}{2012}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2012}+\frac{1}{2013}}\)
1×2+2×3+3×4+....+2011×2012+2012×2013
\(A=\frac{2012+\frac{2011}{2}+\frac{2010}{3}+\frac{2009}{4}+...+\frac{1}{2012}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2012}+\frac{1}{2013}}\)
hỏi A có chia hết cho 3 hay ko ?
1×2×3+2×3×3+3×3×4+.....+2011×2012×3+2012×2013×3
1/1×2+1/2×3+1/3×4 + 1/4×5 +..........+ 1/ 2012×2013