A=20052005+120052006+1<20052005+1+200420052006+1+2004=2005.(20052004+1)2005.(20052005+1)==20052004+120052005+1=B.�=20052005+120052006+1<20052005+1+200420052006+1+2004=2005.(20052004+1)2005.(20052005+1)==20052004+120052005+1=�.
Vậy A < B
A=20052005+120052006+1<20052005+1+200420052006+1+2004=2005.(20052004+1)2005.(20052005+1)==20052004+120052005+1=B.�=20052005+120052006+1<20052005+1+200420052006+1+2004=2005.(20052004+1)2005.(20052005+1)==20052004+120052005+1=�.
Vậy A < B
Đề đúng : So sánh : \(\frac{2003}{2004}+\frac{2004}{2005}+\frac{2005}{2006}\)với 3
Ta có :
\(\frac{2003}{2004}< \frac{2004}{2004}=1\)
\(\frac{2004}{2005}< \frac{2005}{2005}=1\)
\(\frac{2005}{2006}< \frac{2006}{2006}=1\)
\(\Rightarrow\frac{2003}{2004}+\frac{2004}{2005}+\frac{2005}{2006}< 1+1+1\)
\(\Rightarrow\frac{2003}{2004}+\frac{2004}{2005}+\frac{2005}{2003}< 3\)
Chúc bạn học tốt !!!
A=12+14+18+116+132𝐴=12+14+18+116+132
=1632+832+432+232+132=1632+832+432+232+132
=3132=3132
Xét: 1−A=1−3132=1321-𝐴=1-3132=132
Xét: 1−20232024=
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