Question

9．計(jì)算：

$\frac{12}{13}$×$\frac{26}{27}$=	$\frac{3}{13}$×$\frac{39}{42}$=	36×$\frac{10}{9}$×$\frac{3}{5}$=	$\frac{15}{16}$×$\frac{20}{21}$×$\frac{1}{5}$=
$\frac{4}{33}$×22×9=	$\frac{9}{10}$+$\frac{2}{3}$-$\frac{5}{6}$=	$\frac{3}{16}$×$\frac{3}{4}$×$\frac{8}{27}$=	$\frac{3}{4}$×8×$\frac{5}{4}$=
25×$\frac{2}{27}$×$\frac{3}{5}$=	$\frac{3}{4}$×$\frac{8}{15}$×$\frac{10}{13}$=	90×$\frac{2}{3}$×$\frac{5}{6}$=	$\frac{9}{5}$×$\frac{2}{3}$×$\frac{35}{18}$=

Answer 1

分析 根據(jù)分?jǐn)?shù)乘法的計(jì)算方法進(jìn)行計(jì)算即可．

解答 解：

$\frac{12}{13}$×$\frac{26}{27}$=$\frac{8}{9}$	$\frac{3}{13}$×$\frac{39}{42}$=$\frac{3}{14}$	36×$\frac{10}{9}$×$\frac{3}{5}$=24	$\frac{15}{16}$×$\frac{20}{21}$×$\frac{1}{5}$=$\frac{5}{28}$
$\frac{4}{33}$×22×9=24	$\frac{9}{10}$+$\frac{2}{3}$-$\frac{5}{6}$=$\frac{11}{15}$	$\frac{3}{16}$×$\frac{3}{4}$×$\frac{8}{27}$=$\frac{1}{24}$	$\frac{3}{4}$×8×$\frac{5}{4}$=$\frac{15}{2}$
25×$\frac{2}{27}$×$\frac{3}{5}$=$\frac{10}{9}$	$\frac{3}{4}$×$\frac{8}{15}$×$\frac{10}{13}$=$\frac{4}{13}$	90×$\frac{2}{3}$×$\frac{5}{6}$=50	$\frac{9}{5}$×$\frac{2}{3}$×$\frac{35}{18}$=$\frac{7}{3}$

點(diǎn)評(píng) 考查了分?jǐn)?shù)乘法的口算能力及其計(jì)算方法的靈活運(yùn)用．