Question

3．計(jì)算：
$\frac{8}{9}$×$\frac{1}{4}$×$\frac{8}{3}$；                    3÷$\frac{3}{5}$÷15；                        $\frac{9}{4}$÷$\frac{5}{12}$×$\frac{5}{21}$．

Answer 1

分析 按照從左向右的順序進(jìn)行計(jì)算．

解答 解：（1）$\frac{8}{9}$×$\frac{1}{4}$×$\frac{8}{3}$
=$\frac{2}{9}$×$\frac{8}{3}$
=$\frac{16}{27}$；

（2）3÷$\frac{3}{5}$÷15
=5÷15
=$\frac{1}{3}$；

（3）$\frac{9}{4}$÷$\frac{5}{12}$×$\frac{5}{21}$
=$\frac{27}{5}$×$\frac{5}{21}$
=$\frac{9}{7}$．

點(diǎn)評(píng) 考查了分?jǐn)?shù)四則混合運(yùn)算，注意運(yùn)算順序和運(yùn)算法則，然后再進(jìn)一步計(jì)算．