Question

tính nhanh

2006x2007-1997 / 2006x2005 +2015

 

Answer 1

= 2006 x ( 2005 + 2 ) - 1997 / 2006 x 2005 + 2015

= 2006 x 2005 + 2006 x 2 -1997 / 2006 x 2005 + 2015

= 2006 x 2005 + 4012 - 1997 / 2006 x 2005 + 2015

= 2006 x 2015 + 2015 / 2006 x 2005 + 2015

= 1

Nhớ k nha

Answer 2

\(\frac{2006\times2007-1997}{2006\times2005+2015}=\frac{2006\times\left(2005+2\right)-1997}{2006\times2005+2015}\)

\(=\frac{2006\times2005+2006\times2-1997}{2006\times2005+2015}\)

\(=\frac{2006\times2005+4012-1997}{2006\times2005+2015}=\frac{2006\times2005+2015}{2006\times2005+2015}=1\)

Answer 3

2006 X 2017 - 1997 / 2006x2005+2015  = 2017-1997 / 2005 +2015  =  10 / 4020  =  1 /402