Question

9．直接写出结果．

$\frac{4}{5}$×$\frac{5}{16}$=	$\frac{4}{9}$×$\frac{3}{8}$=	$\frac{1}{2}$×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 根据分数乘分数，分数乘整数的计算方法，首先分子分母约分，然后分子分母分别相乘得到积的分子分母；0乘任何数等于0；即可得解．

解答 解：直接写出结果．

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

点评 此题考查了分数的乘法，首先分子分母约分可以是计算简化．