Question

12．直接寫(xiě)得數(shù)．

$\frac{1}{3}$×0.9=	$\frac{1}{4}$×$\frac{2}{5}$=	$\frac{5}{6}$×1.2=	$\frac{7}{12}$×$\frac{3}{14}$=	4.5×$\frac{3}{5}$=
9×$\frac{7}{18}$=	$\frac{4}{25}$×100=	1.8×$\frac{1}{6}$=	$\frac{4}{11}$×$\frac{11}{4}$=	$\frac{2}{3}$×$\frac{9}{10}$=

Answer 1

分析 分子分母首先約分，然后分別相乘，即可得解．

解答 解：

$\frac{1}{3}$×0.9=0.3	$\frac{1}{4}$×$\frac{2}{5}$=$\frac{1}{10}$	$\frac{5}{6}$×1.2=1	$\frac{7}{12}$×$\frac{3}{14}$=$\frac{1}{8}$	4.5×$\frac{3}{5}$=2.7
9×$\frac{7}{18}$=3$\frac{1}{2}$	$\frac{4}{25}$×100=16	1.8×$\frac{1}{6}$=0.3	$\frac{4}{11}$×$\frac{11}{4}$=1	$\frac{2}{3}$×$\frac{9}{10}$=$\frac{3}{5}$

點(diǎn)評(píng) 掌握分?jǐn)?shù)乘法的方法時(shí)解決此題的關(guān)鍵．