Question

13．直接寫(xiě)得數(shù)．

$\frac{3}{4}$×16=	0.3×$\frac{5}{6}$=	$\frac{3}{5}$÷$\frac{9}{10}$=	$\frac{5}{6}$÷$\frac{7}{8}$×$\frac{7}{8}$=
12÷$\frac{3}{5}$=	$\frac{5}{7}$×$\frac{2}{3}$÷$\frac{5}{7}$=	$\frac{1}{2}$×$\frac{1}{3}$÷$\frac{1}{2}$×$\frac{1}{3}$=	0×$\frac{7}{12}$+$\frac{1}{8}$=

Answer 1

分析 根據(jù)分?jǐn)?shù)和小數(shù)加減乘除法的計(jì)算方法進(jìn)行計(jì)算．
$\frac{5}{6}$÷$\frac{7}{8}$×$\frac{7}{8}$、$\frac{5}{7}$×$\frac{2}{3}$÷$\frac{5}{7}$、$\frac{1}{2}$×$\frac{1}{3}$÷$\frac{1}{2}$×$\frac{1}{3}$根據(jù)乘法交換律和結(jié)合律進(jìn)行簡(jiǎn)算．

解答 解：

$\frac{3}{4}$×16=12	0.3×$\frac{5}{6}$=0.25	$\frac{3}{5}$÷$\frac{9}{10}$=$\frac{2}{3}$	$\frac{5}{6}$÷$\frac{7}{8}$×$\frac{7}{8}$=$\frac{5}{6}$
12÷$\frac{3}{5}$=20	$\frac{5}{7}$×$\frac{2}{3}$÷$\frac{5}{7}$=$\frac{2}{3}$	$\frac{1}{2}$×$\frac{1}{3}$÷$\frac{1}{2}$×$\frac{1}{3}$=$\frac{1}{9}$	0×$\frac{7}{12}$+$\frac{1}{8}$=$\frac{1}{8}$

點(diǎn)評(píng) 口算時(shí)，注意運(yùn)算符號(hào)和數(shù)據(jù)，然后再進(jìn)一步計(jì)算．