Question

1．計(jì)算下面各題．
$\frac{15}{22}$÷10         45÷$\frac{9}{14}$           $\frac{3}{5}$÷$\frac{1}{6}$       $\frac{2}{7}$÷$\frac{8}{21}$     $\frac{2}{9}$×$\frac{3}{8}$÷$\frac{6}{7}$    4÷$\frac{8}{3}$-$\frac{3}{5}$    $\frac{3}{4}$×$\frac{5}{6}$+$\frac{3}{4}$×$\frac{1}{6}$．

Answer 1

分析 根據(jù)分?jǐn)?shù)四則混合運(yùn)算的順序，按照分?jǐn)?shù)四則運(yùn)算的計(jì)算法則進(jìn)行計(jì)算即可，其中$\frac{3}{4}$×$\frac{5}{6}$+$\frac{3}{4}$×$\frac{1}{6}$，運(yùn)用乘法分配律簡(jiǎn)算．

解答 解：$\frac{15}{22}÷10$
=$\frac{15}{22}×\frac{1}{10}$
=$\frac{3}{44}$；

45$÷\frac{9}{14}$
=$45×\frac{14}{9}$
=70；

$\frac{3}{5}÷\frac{1}{6}$
=$\frac{3}{5}×6$
=3$\frac{3}{5}$；

$\frac{2}{7}÷\frac{8}{21}$
=$\frac{2}{7}×\frac{21}{8}$
=$\frac{3}{4}$；

$\frac{2}{9}×\frac{3}{8}÷\frac{6}{7}$
=$\frac{2}{9}×\frac{3}{8}×\frac{7}{6}$
=$\frac{7}{72}$；

$4÷\frac{8}{3}-\frac{3}{5}$
=$4×\frac{3}{8}-\frac{3}{5}$
=$\frac{3}{2}-\frac{3}{5}$
=$\frac{9}{10}$；

$\frac{3}{4}$×$\frac{5}{6}$+$\frac{3}{4}$×$\frac{1}{6}$
=$\frac{3}{4}×（\frac{5}{6}+\frac{1}{6}）$
=$\frac{3}{4}×1$
=$\frac{3}{4}$．

點(diǎn)評(píng) 此題考查的目的是理解掌握分?jǐn)?shù)四則混合運(yùn)算的順序，以及它們的計(jì)算法則，并且能夠正確熟練地進(jìn)行計(jì)算．