= (2010 + 1) x 2009 - 1/ 2010 x 2009 + 2008
= 2010 x 2009 + 1 x 2009 - 1/2010 x 2009 + 2008
= 2010 x 2009 + 2009 - 1/2010 x 2009 + 2008
= 2010 x 2009 + 2008 / 2010 x 2009 + 2008
= 1 (vì tử số bằng mẫu số)
Vậy giá trị biểu thức là 1.
[mik lm mỗi phần b như bn nói thôi nhé]
a) \(\dfrac{7}{15}+\dfrac{9}{16}+\dfrac{8}{15}+\dfrac{7}{16}=\left(\dfrac{7}{15}+\dfrac{8}{15}\right)+\left(\dfrac{9}{16}+\dfrac{7}{16}\right)=1+1=2\)
b) \(\dfrac{2011\times2009-1}{2010\times2009+2008}\)
\(=\dfrac{2010\times2009+2009-1}{2010\times2009+2008}\)
\(=\dfrac{2010\times2009+2008}{2010\times2009+2008}\)
\(=1\)
= (\(\dfrac{7}{16}+\dfrac{9}{16}\)) + ( \(\dfrac{7}{15}+\dfrac{8}{15}\))
= 1 + 1
= 2
