Ta có \(\frac{900}{899}=1+\frac{1}{899}\)
\(\frac{899}{898}=1+\frac{1}{898}\)
Nhận thấy \(\frac{1}{898}>\frac{1}{899}\)
=> \(1+\frac{1}{898}>\frac{1}{899}+1\)
=> \(\frac{899}{898}>\frac{900}{899}\)
Ta có: \(\frac{900}{899}\)=\(\frac{899+1}{899}\)= 1 + \(\frac{1}{899}\)
\(\frac{899}{898}\)=\(\frac{898+1}{898}\)= 1 + \(\frac{1}{898}\)
Vì 899 > 898
nên \(\frac{1}{899}\)<\(\frac{1}{898}\)
\(\Rightarrow\)1 + \(\frac{1}{899}\)< 1 +\(\frac{1}{898}\)
\(\Rightarrow\)\(\frac{900}{899}\)<\(\frac{899}{898}\)
Vậy \(\frac{900}{899}\)<\(\frac{899}{898}\).