Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\frac{2008\times2009+1000}{2009\times2009-1009}=\frac{2008\times2009+1000}{2008\times2009+2009-1009}=\frac{2008\times2009+1000}{2008\times2009+1000}=1\)
2009 x 17 + 4018 x 41 + 2009 = 2009 x 17 + 2009 x (2 x 41) + 2009
= 2009 x 17 + 2009 x 52 + 2009 x 1
= 2009 x (17 + 52 +1)
= 2009 x 100
= 200900
\(2009+2009\times99\)
\(=2009\times\left(99+1\right)\)
\(=2009\times100\)
\(=200900\)
Ta có:
2006/2007 + 2007/2008 + 2008/2009 + 2009/2006
= 1 - 1/2007 + 1 - 1/2008 + 1 - 1/2009 + 1 + 3/2006
= (1 + 1 + 1 + 1) - (1/2007 + 1/2008 + 1/2009) + 3/2006
= 4 - (1/2007 + 1/2008 + 1/2009) + 3/2006
Vì 1/2007 < 1/2006
1/2008 < 1/2006
1/2009 < 1/2006
=> 1/2007 + 1/2008 + 1/2009 < 3/2006
=> -(1/2007 + 1/2008 + 1/2009) + 3/2006 > 0
=> 4 - (1/2007 + 1/2008 + 1/2009) + 3/2006 > 4 - 0 = 4
=> 2006/2007 + 2007/2008 + 2008/2009 + 2009/2006 > 4
Ta có:
2006/2007 + 2007/2008 + 2008/2009 + 2009/2006
= 1 - 1/2007 + 1 - 1/2008 + 1 - 1/2009 + 1 + 3/2006
= (1 + 1 + 1 + 1) - (1/2007 + 1/2008 + 1/2009) + 3/2006
= 4 - (1/2007 + 1/2008 + 1/2009) + 3/2006
Vì 1/2007 < 1/2006
1/2008 < 1/2006
1/2009 < 1/2006
=> 1/2007 + 1/2008 + 1/2009 < 3/2006
=> -(1/2007 + 1/2008 + 1/2009) + 3/2006 > 0
=> 4 - (1/2007 + 1/2008 + 1/2009) + 3/2006 > 4 - 0 = 4
=> 2006/2007 + 2007/2008 + 2008/2009 + 2009/2006 > 4
2009+2009x3+2009+2009x2+2009x(4-1)
= 2009 x (1+3+1+2+4-1)
= 2009 x 10
= 20090
2009 + 2009 x 3 + 2009 + 2009 x 2 + 2009 x ( 4 - 1 )
= 2009 + 2009 x 3 + 2009 + 2009 x 2 + 2009 x 3
= 2009 + 6027 + 2009 + 4018 + 6027
= 2009 + [{ 6027 x 2 } + 4018 ]
= 2009 + [ 12054 + 4018 ]
= 2009 + 16072
= 18081