Question

20．計(jì)算下面各題
$\frac{2}{3}$×90                    
$\frac{25}{4}$×$\frac{8}{15}$                  
$\frac{3}{5}$×$\frac{5}{27}$×$\frac{3}{8}$
$\frac{2}{5}$÷$\frac{7}{15}$                      
9÷$\frac{1}{3}$                   
$\frac{7}{10}$÷8÷$\frac{14}{5}$．

Answer 1

分析 根據(jù)分?jǐn)?shù)乘除法運(yùn)算的計(jì)算法則計(jì)算即可求解．

解答 解：$\frac{2}{3}$×90=60                    

$\frac{25}{4}$×$\frac{8}{15}$=$\frac{10}{3}$                  

$\frac{3}{5}$×$\frac{5}{27}$×$\frac{3}{8}$
=$\frac{1}{9}$×$\frac{3}{8}$
=$\frac{1}{24}$

$\frac{2}{5}$÷$\frac{7}{15}$=$\frac{6}{7}$                      

9÷$\frac{1}{3}$=27                   

$\frac{7}{10}$÷8÷$\frac{14}{5}$
=$\frac{7}{80}$÷$\frac{14}{5}$
=$\frac{1}{32}$

點(diǎn)評(píng) 考查了分?jǐn)?shù)乘除法運(yùn)算，關(guān)鍵是熟練掌握計(jì)算法則正確進(jìn)行計(jì)算．