Question

9．直接寫得數(shù)

$\frac{1}{2}$+$\frac{1}{3}$=	18×$\frac{2}{3}$=	$\frac{9}{10}$×$\frac{2}{3}$=	1×$\frac{7}{8}$=
$\frac{3}{4}$-$\frac{2}{5}$=	$\frac{5}{7}$×21=	$\frac{5}{12}$×$\frac{4}{5}$=	$\frac{2}{13}$×6=
$\frac{3}{10}$×$\frac{5}{6}$	$\frac{2}{9}$×9=	$\frac{5}{8}$×$\frac{2}{5}$=	0×$\frac{1}{100}$=

Answer 1

分析 根據(jù)分?jǐn)?shù)四則運(yùn)算的計(jì)算法則進(jìn)行計(jì)算即可．

解答 解：

$\frac{1}{2}$+$\frac{1}{3}$=$\frac{5}{6}$	18×$\frac{2}{3}$=12	$\frac{9}{10}$×$\frac{2}{3}$=$\frac{3}{5}$	1×$\frac{7}{8}$=$\frac{7}{8}$
$\frac{3}{4}$-$\frac{2}{5}$=$\frac{7}{20}$	$\frac{5}{7}$×21=15	$\frac{5}{12}$×$\frac{4}{5}$=$\frac{1}{3}$	$\frac{2}{13}$×6=$\frac{12}{13}$
$\frac{3}{10}$×$\frac{5}{6}$ $\frac{1}{4}$	$\frac{2}{9}$×9=2	$\frac{5}{8}$×$\frac{2}{5}$=$\frac{1}{4}$	0×$\frac{1}{100}$=0

點(diǎn)評(píng) 此題考查了分?jǐn)?shù)四則運(yùn)算的計(jì)算法則的運(yùn)用．