Question

14．直接填上得數(shù)．

$\frac{1}{3}$×$\frac{2}{5}$=	15÷$\frac{3}{5}$=	$\frac{3}{4}$×2.4=
$\frac{2}{5}$÷$\frac{1}{2}$=	$\frac{2}{15}$×45=	$\frac{2}{3}$÷$\frac{5}{6}$=
$\frac{7}{8}$÷$\frac{3}{4}$×$\frac{3}{4}$=	（$\frac{1}{5}$-$\frac{1}{7}$）×35=	7×$\frac{2}{5}$-$\frac{2}{5}$×2=

Answer 1

分析 根據(jù)分?jǐn)?shù)乘法、分?jǐn)?shù)除法的計算法則，依次進(jìn)行計算即可．

解答 解：

$\frac{1}{3}$×$\frac{2}{5}$=$\frac{2}{15}$	15÷$\frac{3}{5}$=25	$\frac{3}{4}$×2.4=1.8
$\frac{2}{5}$÷$\frac{1}{2}$=$\frac{4}{5}$	$\frac{2}{15}$×45=6	$\frac{2}{3}$÷$\frac{5}{6}$=$\frac{4}{5}$
$\frac{7}{8}$÷$\frac{3}{4}$×$\frac{3}{4}$=$\frac{7}{8}$	（$\frac{1}{5}$-$\frac{1}{7}$）×35=2	7×$\frac{2}{5}$-$\frac{2}{5}$×2=2

點評 明確分?jǐn)?shù)乘法、分?jǐn)?shù)除法的計算法則，是解答此題的關(guān)鍵．