Question

18．寫出4個(gè)大于$\frac{1}{5}$而小于$\frac{1}{4}$的分?jǐn)?shù)$\frac{9}{40}$、$\frac{17}{80}$、$\frac{18}{80}$、$\frac{19}{80}$．

Answer 1

分析 首先把兩個(gè)分?jǐn)?shù)根據(jù)分?jǐn)?shù)的基本性質(zhì)化為分母稍大一點(diǎn)的分?jǐn)?shù)，繼續(xù)擴(kuò)大分母找出4個(gè)分?jǐn)?shù)即可，據(jù)此解答．

解答 解：$\frac{1}{5}=\frac{4}{20}=\frac{8}{40}=\frac{16}{80}$
$\frac{1}{4}=\frac{5}{20}=\frac{10}{40}=\frac{20}{80}$
大于$\frac{1}{5}$而小于$\frac{1}{4}$的分?jǐn)?shù)有$\frac{9}{40}$、$\frac{17}{80}$、$\frac{18}{80}$、$\frac{19}{80}$．
故答案為：$\frac{9}{40}$、$\frac{17}{80}$、$\frac{18}{80}$、$\frac{19}{80}$．

點(diǎn)評(píng) 本題主要考查了學(xué)生根據(jù)分?jǐn)?shù)的基本性質(zhì)來(lái)解決問(wèn)題的能力．