2017 x 1001 - 2017

=2017 x 1001 - 2017 x 1

=2017 x ( 1001 -1 )

=2017 x 1000

=2017000

={ 2017 - 2017} x 1001

=0 x 1001 

=0

 = 2012 x (1001-1) + 2013 x (999+1)

 = 2012 x 1000 + 2013 x 1000

 = 1000 x (2012+2013)

 = 1000 x 4025 = 4025000

k mk nha

 = 2012 x (1001-1) + 2013 x (999+1)

 = 2012 x 1000 + 2013 x 1000

 = 1000 x (2012+2013)

 = 1000 x 4025 = 4025000

Ta có:\(1001=1000+1=x+1\)

\(x^8-1001x^7+1001x^6+...+1001x^2-1001x+250\\ =x^8-\left(x+1\right)x^7+\left(x+1\right)x^6+...+\left(x+1\right)x^2-\left(x+1\right)x\\ =x^8-x^8-x^7+x^7+x^6+...+x^3+x^2-x^2-x+250\\ =-x+250=-1000+250\\ =-750\)

;-; nó dc mà 

. là x á nha

=\(\frac{2006}{2008}.\frac{2001}{2004}.\frac{2008}{2002}.\frac{2004}{2006}.\frac{1001}{2001}\)

=\(\frac{2006.2001.2008.2004.1001}{2008.2004.2002.2006.2001}\)

=\(\frac{1001}{2002}\)

= \(\frac{2006\cdot2001\cdot2008\cdot2004\cdot1001}{2008\cdot2004\cdot2002\cdot2006\cdot2001}\)

= \(\frac{1\cdot1\cdot1\cdot1\cdot1001}{1\cdot1\cdot2002\cdot1\cdot1}\)

= \(\frac{1}{2}\)

423*1001 = 423 * ( 1000 + 1 ) = 423 * 1000 + 423 = 423423

= 423423

\(\frac{2000\cdot2001-1001}{1999\cdot2002-999}=\frac{1999\cdot2001+2001-1001}{1999\cdot2001+1999-999}\)

\(=\frac{1999\cdot2001+1000}{1999\cdot2001+1000}=1\)

=1001

(...) ở giữa số 5 với số 999 là gì v bạn

Tính nhanh

1001 * 789 + 456 * 128 + 912 * 436 

1001 . 789 + 456 . 128 + 912 .436 = 1245789

k nha

2019 + 2017 + 2015 + .... + 1003 + 1001 - 2018 - 2016 - 2014 -.... - 1002 - 1000

=(2019-2018)+(2017-2016)+....+(1001-1000)

=1+1+...+1

= 510