Question

tính nhanh 

Answer 1

\(\dfrac{2004.2007+6}{2005.2005+2009}\)

= \(\dfrac{4022028+6}{4020025+2009}\)

= \(\dfrac{4022034}{4022034}\)

= 1

Answer 2

Xét tử số :

2004 . 2007 + 6

= (2005 - 1) . 2007 + 6

= 2005 . 2007 - 2007 + 6

= 2005 . (2005 + 2) - 2007 + 6

= 2005 . 2005 + 2005 . 2 - 2007 + 6

= 2005 . 2005 + 4010 - 2007 + 6

= 2005 . 2005 + 2009

=>2004.2007+6/2005.2005+2009 =1

Answer 3

Xét tử số :

2004 . 2007 + 6

= (2005 - 1) . 2007 + 6

= 2005 . 2007 - 2007 + 6

= 2005 . (2005 + 2) - 2007 + 6

= 2005 . 2005 + 2005 . 2 - 2007 + 6

= 2005 . 2005 + 4010 - 2007 + 6

= 2005 . 2005 + 2009

=>2004.2007+6/2005.2005+2009 =1

Answer 4

zin

Answer 5

2004 . 2007 + 6

= (2005 - 1) . 2007 + 6

= 2005 . 2007 - 2007 + 6

= 2005 . (2005 + 2) - 2007 + 6

= 2005 . 2005 + 2005 . 2 - 2007 + 6

= 2005 . 2005 + 4010 - 2007 + 6

= 2005 . 2005 + 2009

=>2004.2007+6/2005.2005+2009 =1