Các câu hỏi tương tự
Tìm x:
x . (1/2+1/3+1/4+. . .+1/2011+1/2012)
2012/1+2011/2+2010/3+2009/4+ . . . +2/2011+1/2012
=1
Tim x:
x . (1/2+1/3+1/4+. . .+1/2011+1/2012)
2012/1 +2011/2+2010/3+2009/4+2/2011+1/2012
=1
(1/2+1/3+1/4+...+1/2013).x=2012/1+2011/2+...+2/2011+1/2012
Chứng minh 1×2×3×...×2012×(1+1/2+1/3+1/4+...+1/2012 chia hết cho 3
Ai nhanh mình tk cho nha !
2013+(2013/1+2)+(2013/1+2+3)+(2013/1+2+3+4)+...+(2013/1+2+3+...+2012)
Cho A= (2012/1+2011/2+2010/3+.......+1/2012)/(1/2+1/3+1/4+....+1/2013)
Tinh A
(1/2 + 1/3 + ... +1/2012 + 1/2013).x = 2012/1 + 2012/2 + 2012/3 + ... +2/2011 + 1/2012
A=1/2+1/3+1/4+...+1/2014 phần 2013/1+2012/2+2011/3+...+1/2013
Tính D=( 2×2012): {1+[1:(1+2)]+[1:(1+2+3)]+...+[1:(1+2+3+...+2012)]