Lời giải:
a.
\(\frac{2008\times 2009-2}{2007\times 2009+2007}=\frac{2009\times (2007+1)-2}{2007\times 2009+2007}\\ =\frac{2009\times 2007+2007}{2007\times 2009+2007}=1\)
b.
\(\frac{1995\times 1994-1}{1993\times 1995+1994}=\frac{1995\times (1993+1)-1}{1995\times 1993+1994}\\ =\frac{1995\times 1993+1994}{1995\times 1993+1994}\\ =1\)