Question

7．遞等式計(jì)算
$\frac{3}{25}$×$\frac{3}{4}$×$\frac{10}{9}$          
12×$\frac{3}{4}$÷$\frac{4}{3}$           
$\frac{5}{7}$÷2÷$\frac{8}{5}$．

Answer 1

分析 根據(jù)分?jǐn)?shù)的乘、除法計(jì)算法則進(jìn)行計(jì)算，能約分的先約分．

解答 解：①$\frac{3}{25}$×$\frac{3}{4}$×$\frac{10}{9}$
=$\frac{9}{100}$×$\frac{10}{9}$
=$\frac{1}{10}$；

②12×$\frac{3}{4}$÷$\frac{4}{3}$
=9×$\frac{3}{4}$
=$\frac{27}{4}$；

③$\frac{5}{7}$÷2÷$\frac{8}{5}$
=$\frac{5}{7}$×$\frac{1}{2}$×$\frac{5}{8}$
=$\frac{25}{112}$．

點(diǎn)評(píng) 本題考查了分?jǐn)?shù)的乘除法的計(jì)算法則．