So sánh A và B, biết :
A= 2008 / 977654321 + 2009 / 246813579
B= 2009 / 987654321 + 2008 / 246813579
A < B = B > A
*Ryeo*
\(A=\frac{2008}{977654321}+\frac{2008}{246813579}+\frac{1}{246813579}\)
\(B=\frac{2009}{987654321}+\frac{2008}{246813579}\)
Thấy \(\frac{2008}{977654321}=2008\cdot\frac{1}{977654321}\)với \(\frac{1}{977654321}>\frac{1}{987654321}\)và\(2008>\frac{1}{987654321}\)nên \(\frac{2008}{977654321}>\frac{1}{987654321}\)
Ta cũng có \(\frac{1}{246813579}>\frac{1}{987654321}\)và \(\frac{2008}{246813579}=\frac{2008}{246813579}\)nên A > B.
Vậy A > B
