Question

3．直接寫出得數(shù)．

$\frac{5}{18}$×27=	$\frac{2}{15}$×12=	$\frac{20}{21}$×$\frac{14}{31}$=	1-$\frac{1}{4}$×$\frac{1}{5}$=	36×$\frac{2}{45}$=
$\frac{1}{5}$+$\frac{4}{15}$×9=	$\frac{6}{7}$×$\frac{14}{15}$=	$\frac{25}{39}$×$\frac{3}{4}$=	12×$\frac{3}{10}$=	（$\frac{9}{11}$-$\frac{2}{11}$）×77=

Answer 1

分析 根據(jù)分?jǐn)?shù)四則運(yùn)算的計(jì)算法則及混合運(yùn)算的運(yùn)算順序進(jìn)行計(jì)算即可．

解答 解：

$\frac{5}{18}$×27=$\frac{15}{2}$	$\frac{2}{15}$×12=$\frac{8}{5}$	$\frac{20}{21}$×$\frac{14}{31}$=$\frac{40}{93}$	1-$\frac{1}{4}$×$\frac{1}{5}$=$\frac{19}{20}$	36×$\frac{2}{45}$=$\frac{8}{5}$
$\frac{1}{5}$+$\frac{4}{15}$×9=$\frac{13}{5}$	$\frac{6}{7}$×$\frac{14}{15}$=$\frac{4}{5}$	$\frac{25}{39}$×$\frac{3}{4}$=$\frac{25}{52}$	12×$\frac{3}{10}$=$\frac{18}{5}$	（$\frac{9}{11}$-$\frac{2}{11}$）×77=49

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．