Question

4．直接寫得數(shù)．

$\frac{2}{5}$÷$\frac{3}{5}$=	3÷$\frac{1}{4}$=	$\frac{1}{4}$+$\frac{1}{5}$=	$\frac{1}{2}$×$\frac{2}{3}$=
$\frac{5}{51}$×17=	$\frac{2}{3}$÷$\frac{3}{2}$=	14-$\frac{1}{6}$=	$\frac{6}{25}$×$\frac{5}{6}$=

Answer 1

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

解答 解：

$\frac{2}{5}$÷$\frac{3}{5}$=$\frac{2}{3}$	3÷$\frac{1}{4}$=12	$\frac{1}{4}$+$\frac{1}{5}$=$\frac{9}{20}$	$\frac{1}{2}$×$\frac{2}{3}$=$\frac{1}{3}$
$\frac{5}{51}$×17=$\frac{5}{3}$	$\frac{2}{3}$÷$\frac{3}{2}$=1	14-$\frac{1}{6}$=13$\frac{5}{6}$	$\frac{6}{25}$×$\frac{5}{6}$=$\frac{1}{5}$

點(diǎn)評(píng) 明確分?jǐn)?shù)加法、分?jǐn)?shù)減法、分?jǐn)?shù)乘法、分?jǐn)?shù)除法的計(jì)算法則，是解答此題的關(guān)鍵．