\(\frac{18}{19}=1-\frac{1}{19}\)
\(\frac{17}{18}=1-\frac{1}{18}\)
\(\frac{1}{19}< \frac{1}{18}\)
nên :
\(\frac{18}{19}>\frac{17}{18}\)
\(\frac{18}{19}=1-\frac{1}{19}\)
\(\frac{17}{18}=1-\frac{1}{18}\)
Vì \(\frac{1}{19}< \frac{1}{18}\) nên \(\frac{18}{19}>\frac{17}{18}\)
Ta có :
\(1-\frac{18}{19}=\frac{1}{19}\)
\(1-\frac{17}{18}=\frac{1}{18}\)
mà 1/18 > 1/19
=> 1- 18/19 < 1 - 17/18
=> 18/19 > 17/18