Question

9．直接寫出結(jié)果．

$\frac{4}{5}$×$\frac{5}{16}$=	$\frac{4}{9}$×$\frac{3}{8}$=	$\frac{1}{2}$×2=	$\frac{3}{4}$×$\frac{1}{2}$=
$\frac{7}{6}$×$\frac{1}{7}$=	$\frac{7}{5}$×$\frac{5}{7}$=	$\frac{1}{7}$×7=	6×$\frac{2}{3}$=
$\frac{7}{5}$×$\frac{3}{4}$×$\frac{5}{16}$×0=	$\frac{7}{6}$×$\frac{6}{7}$×$\frac{3}{8}$=

Answer 1

分析 根據(jù)分?jǐn)?shù)乘分?jǐn)?shù)，分?jǐn)?shù)乘整數(shù)的計(jì)算方法，首先分子分母約分，然后分子分母分別相乘得到積的分子分母；0乘任何數(shù)等于0；即可得解．

解答 解：直接寫出結(jié)果．

$\frac{4}{5}$×$\frac{5}{16}$=$\frac{1}{4}$	$\frac{4}{9}$×$\frac{3}{8}$=$\frac{1}{6}$	$\frac{1}{2}$×2=1	$\frac{3}{4}$×$\frac{1}{2}$=$\frac{3}{8}$
$\frac{7}{6}$×$\frac{1}{7}$=$\frac{1}{6}$	$\frac{7}{5}$×$\frac{5}{7}$=1	$\frac{1}{7}$×7=1	6×$\frac{2}{3}$=4
$\frac{7}{5}$×$\frac{3}{4}$×$\frac{5}{16}$×0=0	$\frac{7}{6}$×$\frac{6}{7}$×$\frac{3}{8}$=$\frac{3}{8}$

點(diǎn)評(píng) 此題考查了分?jǐn)?shù)的乘法，首先分子分母約分可以是計(jì)算簡(jiǎn)化．