Question

7．口算

0÷$\frac{2}{5}$×$\frac{5}{3}$=	$\frac{7}{39}$×26=	3.5+$\frac{3}{2}$=	$\frac{3}{4}$×8÷$\frac{3}{4}$×8=
8-2$\frac{1}{3}$=	$\frac{3}{4}$÷$\frac{3}{7}$=	100÷$\frac{1}{10}$×$\frac{1}{100}$=	100$\frac{1}{100}$×100=

Answer 1

分析 ①0除以（乘）任何數(shù)都得0；②約分計(jì)算；③把分?jǐn)?shù)化為小數(shù)計(jì)算；④調(diào)整運(yùn)算順序，使計(jì)算簡(jiǎn)便；⑤把8化成分母為3的分?jǐn)?shù)；⑥把除法變?yōu)槌朔ǎ�約分計(jì)算；⑦把除法變?yōu)槌朔ǎ�約分計(jì)算；⑧把帶分?jǐn)?shù)化為“整數(shù)+分?jǐn)?shù)”的形式，運(yùn)用乘法分配律計(jì)算．

解答 解：

0÷$\frac{2}{5}$×$\frac{5}{3}$=0	$\frac{7}{39}$×26=$\frac{14}{3}$	3.5+$\frac{3}{2}$=5	$\frac{3}{4}$×8÷$\frac{3}{4}$×8=64
8-2$\frac{1}{3}$=5$\frac{2}{3}$	$\frac{3}{4}$÷$\frac{3}{7}$=$\frac{7}{4}$	100÷$\frac{1}{10}$×$\frac{1}{100}$=10	100$\frac{1}{100}$×100=10001

點(diǎn)評(píng) 此題考查了分?jǐn)?shù)的計(jì)算，根據(jù)題目特點(diǎn)，靈活簡(jiǎn)算．