Question

7．直接寫(xiě)出得數(shù)．

14÷35=	$\frac{1}{2}$+$\frac{2}{5}$=	0.77+0.33=
1.4-0.6=	$\frac{7}{8}$×$\frac{1}{7}$=	$\frac{4}{5}$×4+4×$\frac{1}{4}$=
5×0.2=	5-1.4-1.6=	2-$\frac{1}{5}$-$\frac{3}{5}$=

Answer 1

分析 根據(jù)小數(shù)、分?jǐn)?shù)加減乘除法的計(jì)算方法進(jìn)行解答即可，5-1.4-1.6和2-$\frac{1}{5}$-$\frac{3}{5}$可以運(yùn)用減法的性質(zhì)簡(jiǎn)算．

解答 解：

14÷35=0.4	$\frac{1}{2}$+$\frac{2}{5}$=$\frac{9}{10}$	0.77+0.33=1.1
1.4-0.6=0.8	$\frac{7}{8}$×$\frac{1}{7}$=$\frac{1}{8}$	$\frac{4}{5}$×4+4×$\frac{1}{4}$=4$\frac{1}{5}$
5×0.2=1	5-1.4-1.6=2	2-$\frac{1}{5}$-$\frac{3}{5}$=$\frac{6}{5}$

點(diǎn)評(píng) 此題考查了小數(shù)、分?jǐn)?shù)加減乘除法的口算能力，注意靈活運(yùn)用減法的性質(zhì)進(jìn)行簡(jiǎn)算．