Question

6．直接写得数

$\frac{2}{5}$+$\frac{1}{2}$=	3 $\frac{1}{4}$+1.75=	$\frac{3}{5}$÷$\frac{1}{3}$=	$\frac{1}{8}$×$\frac{1}{8}$=	$\frac{2}{3}$×0+3=
$\frac{6}{7}$×$\frac{7}{15}$=	$\frac{5}{6}$-$\frac{1}{2}$=	$\frac{1}{4}$+$\frac{1}{5}$=	$\frac{5}{6}$×$\frac{3}{4}$=	$\frac{4}{5}$×$\frac{1}{4}$÷$\frac{4}{5}$×$\frac{1}{4}$=

Answer 1

分析 根据分数四则运算的计算法则进行计算即可，$\frac{4}{5}$×$\frac{1}{4}$÷$\frac{4}{5}$×$\frac{1}{4}$运用乘法交换律简算．

解答 解：

$\frac{2}{5}$+$\frac{1}{2}$=$\frac{9}{10}$	3 $\frac{1}{4}$+1.75=5	$\frac{3}{5}$÷$\frac{1}{3}$=$\frac{9}{5}$	$\frac{1}{8}$×$\frac{1}{8}$=$\frac{1}{64}$	$\frac{2}{3}$×0+3=3
$\frac{6}{7}$×$\frac{7}{15}$=$\frac{2}{5}$	$\frac{5}{6}$-$\frac{1}{2}$=$\frac{1}{3}$	$\frac{1}{4}$+$\frac{1}{5}$=$\frac{9}{20}$	$\frac{5}{6}$×$\frac{3}{4}$=$\frac{5}{8}$	$\frac{4}{5}$×$\frac{1}{4}$÷$\frac{4}{5}$×$\frac{1}{4}$=$\frac{1}{16}$

点评 此题考查了分数四则运算的计算法则的运用．