Question

17．直接写出得数：

12×$\frac{2}{3}$=	$\frac{4}{21}$×7=	$\frac{9}{13}$×$\frac{26}{27}$=	$\frac{5}{7}$×$\frac{14}{25}$=
$\frac{9}{100}$×0=	$\frac{11}{21}$×$\frac{7}{22}$=	$\frac{6}{7}$×$\frac{5}{18}$=	42×$\frac{5}{6}$=

Answer 1

分析 根据分数乘法的计算方法进行解答即可．

解答 解：

12×$\frac{2}{3}$=8	$\frac{4}{21}$×7=$\frac{4}{3}$	$\frac{9}{13}$×$\frac{26}{27}$=$\frac{2}{3}$	$\frac{5}{7}$×$\frac{14}{25}$=$\frac{2}{5}$
$\frac{9}{100}$×0=0	$\frac{11}{21}$×$\frac{7}{22}$=$\frac{1}{6}$	$\frac{6}{7}$×$\frac{5}{18}$=$\frac{5}{21}$	42×$\frac{5}{6}$=35

点评 此题考查了分数乘法的口算能力．