Question

6．直接寫得數(shù)

$\frac{3}{4}$-$\frac{3}{5}$=	$\frac{5}{18}$÷$\frac{5}{6}$=	$\frac{15}{2}$×$\frac{5}{9}$=	$\frac{5}{7}$×$\frac{7}{15}$=
$\frac{1}{5}$×5÷$\frac{1}{5}$×5=	$\frac{5}{2}$÷$\frac{2}{5}$=	0×$\frac{5}{6}$+$\frac{1}{7}$=	$\frac{1}{2}$×$\frac{1}{5}$÷$\frac{1}{2}$×$\frac{1}{5}$=

Answer 1

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

解答 解：

$\frac{3}{4}$-$\frac{3}{5}$=$\frac{3}{20}$	$\frac{5}{18}$÷$\frac{5}{6}$=$\frac{1}{3}$	$\frac{15}{2}$×$\frac{5}{9}$=$\frac{25}{6}$	$\frac{5}{7}$×$\frac{7}{15}$=$\frac{1}{3}$
$\frac{1}{5}$×5÷$\frac{1}{5}$×5=25	$\frac{5}{2}$÷$\frac{2}{5}$=$\frac{25}{4}$	0×$\frac{5}{6}$+$\frac{1}{7}$=$\frac{1}{7}$	$\frac{1}{2}$×$\frac{1}{5}$÷$\frac{1}{2}$×$\frac{1}{5}$=$\frac{1}{25}$

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．