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\(=\frac{2005\times\left(2006+1\right)-1}{2004+2005\times2006}=\frac{2005\times2006+2005\times1-1}{2004+2005\times2006}=\frac{2005\times2006+2004}{2004+2005\times2006}=1\)
\(\frac{2006\times2007-2593}{2005\times2006+1419}=\frac{2005\times2006+2\times2006-2593}{2005\times2006+1419}\)
\(=\frac{2005\times2006+4012-2593}{2005\times2006+1419}=\frac{2005\times2006+1419}{2005\times2016+1419}=1\)
2006 * ( 2005 + 2 ) - 2593 / 2005 * 2006 + 1419
2006 * 2005 + 2006 * 2 - 2593 / 2005 * 2006 + 1419
2006 * 2005 + 4012 - 2593 / 2005 * 2006 + 1419
2006 * 2005 + 1419 / 2005 * 2006 + 1419 = 1
k cho tui nha
y=\(\frac{2006x2005-1}{2004x2006+2005}=\frac{2006x2005-1}{\left(2005-1\right)x2006+2005}=\frac{2006x2005-1}{2005x2006-2006+2005}=\frac{2006x2005-1}{2005x2006-1}=1\)
ta thay : 1- 2005/2006 = 1/2006 ; 1 - 2006/2007 = 1/2007
vi 1/2006 > 1/2007 nen 2005/2006 < 2006/2007
bai nay dung 100 % . bai la phuong phap phan bu , ban co the lam phuong phap phan so trung gian , quy dong tu so hoac mau so
\(1-\frac{2005}{2006}=\frac{1}{2006};1-\frac{2006}{2007}=\frac{1}{2007}\)
Vì \(\frac{1}{2006}>\frac{1}{2007}\Rightarrow\frac{2005}{2006}< \frac{2006}{2007}\)
2005/2006 < 2006/2007
bn so sánh phần bù đi bn,mk làm theo cách so sánh phần bù
=13/12x14/13x15/14x16/15x...x2006/2005x2007/2006x2008/2007
=2008/12
=502/3
A = 1\(\dfrac{1}{12}\) \(\times\) 1\(\dfrac{1}{13}\) \(\times\) 1\(\dfrac{1}{14}\) \(\times\) 1\(\dfrac{1}{15}\) \(\times\) ... \(\times\) 1\(\dfrac{1}{2005}\) \(\times\) 1\(\dfrac{1}{2006}\) \(\times\) 1\(\dfrac{1}{2007}\)
A = ( 1 + \(\dfrac{1}{12}\)) \(\times\) ( 1 + \(\dfrac{1}{13}\)) \(\times\) ( 1 + \(\dfrac{1}{14}\)) \(\times\)...\(\times\) ( 1 + \(\dfrac{1}{2006}\))\(\times\)(1+\(\dfrac{1}{2007}\))
A = \(\dfrac{13}{12}\) \(\times\) \(\dfrac{14}{13}\) \(\times\) \(\dfrac{15}{14}\) \(\times\) ...\(\times\) \(\dfrac{2007}{2006}\) \(\times\) \(\dfrac{2008}{2007}\)
A = \(\dfrac{13\times14\times15\times...\times2007}{13\times14\times15\times...\times2007}\) \(\times\) \(\dfrac{2008}{12}\)
A = 1 \(\times\) \(\dfrac{502}{3}\)
A = \(\dfrac{502}{3}\)
bằng 1/1 nhé
gạch các số giống nhau
sos cứu bt tiếng anh với