Question

9．直接寫出得數(shù)．

$20×\frac{1}{5}$=	$\frac{2}{5}×6$=	$30×\frac{5}{6}$=	$\frac{7}{9}×\frac{5}{8}×0$=
$\frac{1}{7}×\frac{2}{3}$=	$1÷\frac{2}{3}×\frac{3}{10}$=	$39×\frac{7}{13}×\frac{2}{3}$=	$3÷\frac{3}{7}÷\frac{2}{9}$=

Answer 1

分析 根據(jù)分數(shù)乘除法運算的計算法則進行計算即可．

解答 解：

$20×\frac{1}{5}$=4	$\frac{2}{5}×6$=$\frac{12}{5}$	$30×\frac{5}{6}$=25	$\frac{7}{9}×\frac{5}{8}×0$=0
$\frac{1}{7}×\frac{2}{3}$=$\frac{2}{21}$	$1÷\frac{2}{3}×\frac{3}{10}$=$\frac{9}{20}$	$39×\frac{7}{13}×\frac{2}{3}$=14	$3÷\frac{3}{7}÷\frac{2}{9}$=$\frac{63}{2}$

點評 此題考查了分數(shù)四則運算的計算法則的運用．