Question

So sánh 2 phân số sau :

    \(\frac{217}{18}\)và \(\frac{218}{19}\)

Answer 1

Ta có : \(\frac{217}{18}-1=\frac{199}{18}\)

\(\frac{218}{19}-1=\frac{199}{19}\)

Do \(\frac{199}{18}>\frac{199}{19}\Rightarrow\frac{217}{18}< \frac{218}{19}\)

Answer 2

\(\frac{217}{18}=12+\frac{1}{8}>11+1>11+\frac{9}{19}=\frac{218}{19}\)

Answer 3

217/18 - 1 = 199/18 ; 218/19 - 1 = 199/19

199/18 > 199/19 nên 217/18 > 217/19

Answer 4

\(\frac{217}{18}-1=\frac{199}{18}\)

\(\frac{218}{19}-1=\frac{199}{19}\)

Vì \(\frac{199}{18}>\frac{199}{19}\)

nên \(\frac{217}{18}< \frac{218}{19}\)