Question

13．口算

$\frac{1}{3}$+$\frac{2}{3}$÷2=	25÷$\frac{1}{5}$=	1÷$\frac{1}{5}$×5=	12×101=
$\frac{1}{6}$×$\frac{1}{6}$÷$\frac{1}{6}$×$\frac{1}{6}$=	0.83+3%=	$\frac{1}{7}$-$\frac{1}{9}$=	16÷16%=

Answer 1

分析 根據(jù)分?jǐn)?shù)、百分?jǐn)?shù)四則運(yùn)算的計(jì)算法則及混合運(yùn)算的運(yùn)算順序進(jìn)行口算即可，$\frac{1}{6}$×$\frac{1}{6}$÷$\frac{1}{6}$×$\frac{1}{6}$運(yùn)用乘除抵消簡算，12×101運(yùn)用乘法分配律簡算．

解答 解：

$\frac{1}{3}$+$\frac{2}{3}$÷2=$\frac{2}{3}$	25÷$\frac{1}{5}$=125	1÷$\frac{1}{5}$×5=25	12×101=1212
$\frac{1}{6}$×$\frac{1}{6}$÷$\frac{1}{6}$×$\frac{1}{6}$=$\frac{1}{36}$	0.83+3%=0.86	$\frac{1}{7}$-$\frac{1}{9}$=$\frac{2}{63}$	16÷16%=100

點(diǎn)評 此題考查了分?jǐn)?shù)和百分?jǐn)?shù)四則運(yùn)算的計(jì)算法則的運(yùn)用．