Question

19．直接寫出得數(shù)．

$\frac{2}{5}$×$\frac{1}{2}$=	$\frac{6}{7}$×$\frac{7}{15}$=	$\frac{3}{5}$÷$\frac{1}{3}$=	$\frac{1}{8}$÷$\frac{1}{8}$=
$\frac{5}{6}$÷$\frac{1}{2}$=	$\frac{11}{3}$×$\frac{21}{22}$=	$\frac{8}{13}$÷$\frac{4}{7}$=	$\frac{3}{4}$×$\frac{2}{5}$=
$\frac{2}{3}$×0﹢3=	3$\frac{1}{4}$÷1.75=	（$\frac{5}{6}$+$\frac{1}{6}$）×$\frac{3}{4}$=	$\frac{4}{5}$×$\frac{1}{4}$÷$\frac{4}{5}$×$\frac{1}{4}$=

Answer 1

分析 根據(jù)分?jǐn)?shù)加減乘除法的計算方法進(jìn)行解答即可．

解答 解：

$\frac{2}{5}$×$\frac{1}{2}$=$\frac{1}{5}$	$\frac{6}{7}$×$\frac{7}{15}$=$\frac{2}{5}$	$\frac{3}{5}$÷$\frac{1}{3}$=$\frac{9}{5}$	$\frac{1}{8}$÷$\frac{1}{8}$=1
$\frac{5}{6}$÷$\frac{1}{2}$=$\frac{5}{3}$	$\frac{11}{3}$×$\frac{21}{22}$=$\frac{7}{2}$	$\frac{8}{13}$÷$\frac{4}{7}$=$\frac{14}{13}$	$\frac{3}{4}$×$\frac{2}{5}$=$\frac{3}{10}$
$\frac{2}{3}$×0﹢3=3	3$\frac{1}{4}$÷1.75=$\frac{13}{7}$	（$\frac{5}{6}$+$\frac{1}{6}$）×$\frac{3}{4}$=$\frac{3}{4}$	$\frac{4}{5}$×$\frac{1}{4}$÷$\frac{4}{5}$×$\frac{1}{4}$=$\frac{1}{16}$

點評 此題考查了分?jǐn)?shù)加減乘除法的口算能力．