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Ta có:
2006x2005-1/2004x2006+2005 = 2006x(2004+1)-1 / 2004x2006+2005
= 2006x2004 + 2006 -1 / 2004x2006+2005
= 2006x2004+2005 / 2004x2006+2005
= 1
2006*2005-1/2004*2006+2005
=4022030 - 168/167 + 2005
=4022028,994 + 2005
=4024033 , 994
2006*2005-1/2004*2006+2005
=2006*2005-1/(2005-1)*2006+2005
=2006*2005-1/2005*2006-2006+2005
=2006*2005-1/2005*2006-1
=1
\(=\frac{2006x\left(2004+1\right)-1}{2004x2006+2005}=\frac{2006x2004+2005}{2004x2006+2005}=1\)
\(=\frac{2006\cdot2004+2006.1-1}{2004\cdot2006+2005}\)
\(=\frac{2006\cdot2004+2006-1}{2004\cdot2006+2005}\)
\(=\frac{2006\cdot2004+2005}{2004\cdot2006+2005}\)
\(\Rightarrow1\)
\(a,\frac{15.8}{4.5}=\frac{3.2}{1}=6\)
\(b,\frac{81.25.2.12}{5.9.3.6}=\frac{2.5.2.2}{1.1.3.1}=\frac{40}{3}\)
\(c,\frac{2005.2006-1}{2006.2004+2005}=\frac{\left(2004+1\right).2006-1}{2006.2004+2005}\)
\(=\frac{2006.2004+2006.1-1}{2006.2004+2005}\)
\(=\frac{1+2006-1}{1+2005}\)
\(=\frac{2006}{2006}=1\)
(2004*2005+2006*6-6)/(2005*197+4*2005) = 10