=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.............+1/2011-1/2012+1/1012-1/2013
=1-1/2013
=2012/2013
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Tính nhanh
\(\frac{2014+\frac{2013}{2}+\frac{2012}{3}+\frac{2011}{4}+\frac{2010}{5}+...+\frac{2}{2013}+\frac{1}{2014}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{2012}+\frac{1}{2013}+\frac{1}{2014}}\)
Giải tự luận hộ mình nha!!!!!!!! Mình cảm ơn!!!
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 ?
Hãy chứng minh A = B , biết:
A = 1 + (1+ 2) + (1+ 2+ 3) + ...........+ ( 1+ 2+ 3+ 4+ ...+ 2013)
B = 2013 x 1 + 2012 x 2 + 2011 x 3 + ......+ 2 x 2012 + 1 x 2013
Tính nhanh (1/1):2+(1/2):3+1/3:4+...+(1/2012):2013+(1/2013):2014
tim x nha mn
l,[12 nhan 15 - x] nhan 1/4= 120 nhan 1/4
i, [x nhan 0,25 cong 2012 ] nhan 2013 =[50 cong 2012] nhan 2013
k,[ x - 1/2] nhan 5/3 = 7/4 - 1/2
\(choA=\frac{2012+\frac{2011}{2}+\frac{2010}{3}+\frac{2009}{4}+...+\frac{1}{2012}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2012}+\frac{1}{2013}}.hỏiAchia3dưbaonhiêu\)
1/3*4 + 1/4*5 + .........+1/2012*2013 = ?
1×2+2×3+3×4+....+2011×2012+2012×2013
A=2+4+6+...+2012 B=1+3+5+7=9+...+2013