Question

[Vương Nguyên]

So sánh A với 4

A = 2006/2007 + 2007/2008 + 2008/2009 +2009/2006

Answer 1

[Devil]

2006/2007<1

2007/2008<1

2008<2009<1

2009/2006>1

A=2006/2007+2007/2008+2008/2009+2009/2006\(\approx\)3+1=4

Answer 2

[Kẻ Huỷ Diệt]

 \(A\approx4\)