cho A= 2007/2008 + 2008/2009 + 2009/2010
Cho B= 2007 + 2008 +2009/ 2008 + 2009 + 2010
Hãy so sánh A vá B.
So sánh A và B biết: A= \(\dfrac{2008+2008+2010}{2009+2010+2011}\) và B= \(\dfrac{2008}{2009}\)+ \(\dfrac{2009}{2010}\)+ \(\dfrac{2010}{2011}\)
tính 2010*2010-2009*2009+2008*2008-........+2*2-1*1
a) 2010/1+2009/2+2008/3+ ... +1/2010+2010 : 1+1/2+1/3+ ... +1/2010=
b) 1/2011+1/2010+1/2009+ ... +1/3+1/2 : 2010/1+2009/2+2008/3+ ... +1/2010=
2010×2010 - 2009×2009 +2008×2008-...+2×2-1×1 ai làm nhanh nhất mk tk cho
Tính nhanh:
a,1/2009+2/2009+3/2009+......2008/2009
b,2010*2010*20092009-2009*2009*20102010/2009*20052005
2009 . 2010 + 2009 / 2008 . 2010 + 2009
tính 2010*2010-2009*2009+2008-.....+2*2-1*1
2010/2009 - 2009/2008 + 1/2008x2009
giúp mình gấp zới!!!