Question

5．口算

$\frac{2}{3}$×9=	$\frac{3}{4}$×0=	0÷$\frac{3}{2}$=	$\frac{5}{6}$÷$\frac{6}{5}$=	12×$\frac{5}{6}$=
$\frac{7}{24}$×$\frac{6}{14}$=	$\frac{8}{25}$÷$\frac{4}{5}$=	$\frac{4}{9}$÷$\frac{3}{8}$=	$\frac{2}{3}$×3=	$\frac{2}{3}$×$\frac{5}{6}$=

Answer 1

分析 根據(jù)分?jǐn)?shù)乘整數(shù)和一個數(shù)乘分?jǐn)?shù)的計算法則，依次進(jìn)行解答即可．

解答 解：

$\frac{2}{3}$×9=6	$\frac{3}{4}$×0=0	0÷$\frac{3}{2}$=0	$\frac{5}{6}$÷$\frac{6}{5}$=$\frac{25}{36}$	12×$\frac{5}{6}$=10
$\frac{7}{24}$×$\frac{6}{14}$=$\frac{1}{8}$	$\frac{8}{25}$÷$\frac{4}{5}$=$\frac{2}{5}$	$\frac{4}{9}$÷$\frac{3}{8}$=$\frac{32}{27}$	$\frac{2}{3}$×3=2	$\frac{2}{3}$×$\frac{5}{6}$=$\frac{5}{9}$

點評 明確分?jǐn)?shù)乘整數(shù)和一個數(shù)乘分?jǐn)?shù)的計算法則，是解答此題的關(guān)鍵．