Question

17．比較分?jǐn)?shù)的大�。�
$\frac{2}{5}$＜$\frac{2}{3}$              $\frac{5}{6}$＞$\frac{5}{8}$              $\frac{1}{6}$＞$\frac{1}{8}$
$\frac{1}{5}$＜$\frac{1}{3}$              $\frac{3}{4}$＞$\frac{3}{5}$              $\frac{1}{4}$＞$\frac{1}{5}$．

Answer 1

分析 在分?jǐn)?shù)中，分子相同，則分母越小，分?jǐn)?shù)值越大．據(jù)此完成．

解答 解：
$\frac{2}{5}$＜$\frac{2}{3}$              $\frac{5}{6}$＞$\frac{5}{8}$              $\frac{1}{6}$＞$\frac{1}{8}$
$\frac{1}{5}$＜$\frac{1}{3}$              $\frac{3}{4}$＞$\frac{3}{5}$              $\frac{1}{4}$＞$\frac{1}{5}$．
故答案為：＜，＞，＞，＜，＞，＞．

點(diǎn)評(píng) 此題考查了同分子分?jǐn)?shù)大小比較方法的運(yùn)用．