a.
(1 + 3 + 5 + ... + 2007 + 2009 + 2011) x (125125 x 127 - 127127 x 125)
= (1 + 3 + 5 + ... + 2007 + 2009 + 2011) x 0
= 0
b.
\(\frac{2006\times125+1000}{126\times2006-1006}=\frac{2006\times125+1000}{125\times2006+1\times2006-1006}=\frac{2006\times125+1000}{125\times2006+1000}=1\)
a,
( 1+3+5+7+…+2003+2005) x (125 125 x 127 – 127 127 x 125)
= ( 1+3+5+7+…+2003+2005) x (125 x 1001 x 127 – 127 x 1001x 125)
= ( 1+3+5+7+…+2003+2005) x 0 = 0
A = 0
B= 2006
C= 1993
Tui làm sai á ^^
1.Tính nhanh
a.(1 + 3 + 5 + 7 + ......+ 2011 ) x ( 125125 x 127 - 127127 x 125 )
= (1 + 3 + 5 + 7 + ......+ 2011 ) x ( 125 x 1001 x 127 - 127 x 1001 x 125 )
= (1 + 3 + 5 + 7 + ......+ 2011 ) x 0
= 0
b.\(\frac{2006\times125+1000}{126\times2006-1006}\) \(=\)\(\frac{2006\times125+1000}{\left(125+1\right)\times2006-1006}\)\(=\)\(\frac{2006\times125+1000}{125\times2006+2006-1006}\)
\(=\)\(\frac{2006\times125+1000}{125\times2006+1000}\)\(=\)\(1\)
\(c,\)\(\frac{1995\times1990\times1997\times1993\times997}{1997\times1993\times1994\times1995\times995}\)\(=\frac{1990\times997}{1994\times995}\)\(=1\)
