Question

18．

直接寫出得數(shù) 1÷$\frac{5}{7}$=	$\frac{3}{8}$+$\frac{5}{8}$=	$\frac{5}{6}$-$\frac{5}{12}$=	（$\frac{1}{5}$+$\frac{1}{4}$）×20=	$\frac{2}{5}$÷$\frac{3}{5}$=
8×$\frac{1}{6}$=	$\frac{6}{7}$×$\frac{6}{7}$=	$\frac{4}{5}$×$\frac{1}{5}$÷$\frac{4}{5}$×$\frac{1}{5}$=

Answer 1

分析 根據(jù)分?jǐn)?shù)四則運(yùn)算的計(jì)算法則進(jìn)行計(jì)算即可，（$\frac{1}{5}$+$\frac{1}{4}$）×20運(yùn)用乘法分配律簡(jiǎn)算，$\frac{4}{5}$×$\frac{1}{5}$÷$\frac{4}{5}$×$\frac{1}{5}$運(yùn)用乘法交換律簡(jiǎn)算．

解答 解：

1÷$\frac{5}{7}$=$\frac{7}{5}$	$\frac{3}{8}$+$\frac{5}{8}$=1	$\frac{5}{6}$-$\frac{5}{12}$=$\frac{5}{12}$	（$\frac{1}{5}$+$\frac{1}{4}$）×20=9	$\frac{2}{5}$÷$\frac{3}{5}$=$\frac{2}{3}$
8×$\frac{1}{6}$=$\frac{4}{3}$	$\frac{6}{7}$×$\frac{6}{7}$=$\frac{36}{49}$	$\frac{4}{5}$×$\frac{1}{5}$÷$\frac{4}{5}$×$\frac{1}{5}$=$\frac{1}{25}$

點(diǎn)評(píng) 此題考查了分?jǐn)?shù)四則運(yùn)算的計(jì)算法則的運(yùn)用．