Question

10．直接寫得數(shù)：

0.4×0.5=	7.2÷0.4=	25%+75%=	（3+$\frac{1}{5}$）×5=
$\frac{1}{5}$-$\frac{1}{6}$=	$\frac{7}{9}$×45=	8.75-（0.75+3.4）=	1÷0.5=
5÷0.1=	2×0.1=

Answer 1

分析 根據(jù)小數(shù)和分?jǐn)?shù)加減乘除法運(yùn)算的計(jì)算法則計(jì)算即可求解．注意（3+$\frac{1}{5}$）×5根據(jù)乘法分配律計(jì)算，8.75-（0.75+3.4）變形為8.75-0.75-3.4計(jì)算．

解答 解：

0.4×0.5=0.2	7.2÷0.4=18	25%+75%=1	（3+$\frac{1}{5}$）×5=16
$\frac{1}{5}$-$\frac{1}{6}$=$\frac{1}{30}$	$\frac{7}{9}$×45=35	8.75-（0.75+3.4）=4.6	1÷0.5=2
5÷0.1=50	2×0.1=0.2

點(diǎn)評(píng) 考查了小數(shù)和分?jǐn)?shù)加減乘除法運(yùn)算，關(guān)鍵是熟練掌握計(jì)算法則正確進(jìn)行計(jì)算．