Question

3．直接寫出得數(shù)．

$\frac{9}{14}$×$\frac{7}{27}$=	6÷$\frac{1}{3}$=	$\frac{8}{17}$÷$\frac{2}{17}$=	$\frac{1}{6}$+$\frac{3}{4}$=
$\frac{2}{5}$×$\frac{5}{12}$=	0÷$\frac{14}{33}$=	$\frac{1}{8}$×$\frac{1}{7}$=	9×$\frac{1}{9}$÷$\frac{1}{9}$×9=
$\frac{3}{5}$-$\frac{3}{5}$=	$\frac{1}{4}$×$\frac{1}{5}$÷$\frac{1}{4}$×$\frac{1}{5}$=

Answer 1

分析 根據(jù)分數(shù)加減乘除法的計算方法進行計算；
9×$\frac{1}{9}$÷$\frac{1}{9}$×9、$\frac{1}{4}$×$\frac{1}{5}$÷$\frac{1}{4}$×$\frac{1}{5}$根據(jù)乘法交換律和結(jié)合律進行簡算．

解答 解：

$\frac{9}{14}$×$\frac{7}{27}$=$\frac{1}{6}$	6÷$\frac{1}{3}$=18	$\frac{8}{17}$÷$\frac{2}{17}$=4	$\frac{1}{6}$+$\frac{3}{4}$=$\frac{11}{12}$
$\frac{2}{5}$×$\frac{5}{12}$=$\frac{1}{6}$	0÷$\frac{14}{33}$=0	$\frac{1}{8}$×$\frac{1}{7}$=$\frac{1}{56}$	9×$\frac{1}{9}$÷$\frac{1}{9}$×9=81
$\frac{3}{5}$-$\frac{3}{5}$=0	$\frac{1}{4}$×$\frac{1}{5}$÷$\frac{1}{4}$×$\frac{1}{5}$=$\frac{1}{25}$

點評 口算時，注意運算符號和數(shù)據(jù)，然后再進一步計算．