Question

17．直接寫(xiě)出得數(shù)．

$\frac{3}{4}$×8=	$\frac{3}{4}×\frac{2}{3}$=	$\frac{3}{5}×\frac{3}{5}$=	$\frac{5}{8}$×0=
$\frac{4}{15}×\frac{3}{8}$=	14×$\frac{1}{28}$=	5.1×$\frac{3}{17}$=	$\frac{5}{7}×\frac{14}{15}$=

Answer 1

分析 分?jǐn)?shù)乘法：分子相乘的積做分子，分母相乘的積做分母，能約分的先約分．

解答 解：

$\frac{3}{4}$×8=6	$\frac{3}{4}×\frac{2}{3}$=$\frac{1}{2}$	$\frac{3}{5}×\frac{3}{5}$=$\frac{9}{25}$	$\frac{5}{8}$×0=0
$\frac{4}{15}×\frac{3}{8}$=$\frac{1}{10}$	14×$\frac{1}{28}$=$\frac{1}{2}$	5.1×$\frac{3}{17}$=0.9	$\frac{5}{7}×\frac{14}{15}$=$\frac{2}{3}$

點(diǎn)評(píng) 本題考查了分?jǐn)?shù)乘法的計(jì)算，計(jì)算時(shí)要細(xì)心，注意把結(jié)果化成最簡(jiǎn)分?jǐn)?shù)．