Question

12．大于$\frac{1}{5}$而小于$\frac{1}{4}$的分?jǐn)?shù)有（　�。﹤�(gè)．

• A． 1
• B． 2
• C． 無數(shù)

Answer 1

分析 介于任何兩個(gè)不同數(shù)之間的數(shù)都有無數(shù)個(gè)，大于$\frac{1}{5}$小于$\frac{1}{4}$的分?jǐn)?shù)有$\frac{9}{40}$、$\frac{17}{80}$、$\frac{18}{80}$、$\frac{19}{80}$…，有無數(shù)個(gè)，據(jù)此判斷即可．

解答 解：大于$\frac{1}{5}$小于$\frac{1}{4}$的分?jǐn)?shù)有：$\frac{9}{40}$、$\frac{17}{80}$、$\frac{18}{80}$、$\frac{19}{80}$…，有無數(shù)個(gè)．
故選：C．

點(diǎn)評(píng) 此題關(guān)鍵明白介于任何兩個(gè)不同數(shù)之間的數(shù)都有無數(shù)個(gè)．