Question

11．直接寫出得數(shù)．

$\frac{2}{3}$+0.6=	$\frac{2}{7}$×21=
$\frac{3}{5}$÷$\frac{3}{10}$=	$\frac{1}{8}$+87.5%=
0.75÷$\frac{3}{8}$=	1-$\frac{1}{6}$=
0÷$\frac{21}{116}$=	1÷$\frac{1}{6}$×6=
65%-36%=	$\frac{1}{4}$×$\frac{5}{6}$×$\frac{1}{4}$÷$\frac{5}{6}$=

Answer 1

分析 根據(jù)分?jǐn)?shù)和小數(shù)加減乘除法的計算方法進(jìn)行計算．
$\frac{1}{4}$×$\frac{5}{6}$×$\frac{1}{4}$÷$\frac{5}{6}$，根據(jù)乘法交換律和結(jié)合律進(jìn)行簡算．

解答 解：

$\frac{2}{3}$+0.6=$\frac{19}{15}$	$\frac{2}{7}$×21=6
$\frac{3}{5}$÷$\frac{3}{10}$=2	$\frac{1}{8}$+87.5%=1
0.75÷$\frac{3}{8}$=2	1-$\frac{1}{6}$=$\frac{5}{6}$
0÷$\frac{21}{116}$=0	1÷$\frac{1}{6}$×6=36
65%-36%=0.29	$\frac{1}{4}$×$\frac{5}{6}$×$\frac{1}{4}$÷$\frac{5}{6}$=$\frac{1}{16}$

點(diǎn)評 口算時，注意運(yùn)算符號和數(shù)據(jù)，然后再進(jìn)一步計算．