Question

14．直接寫出得數(shù)．

3.8+0.62=	0.15×0.8=	0.56÷0.7=	20%×5%=
$\frac{2}{3}$-0.5=	$\frac{3}{4}$÷12=	1.6+0.4×10=	$\frac{1}{2}$×$\frac{1}{3}$÷$\frac{1}{2}$×$\frac{1}{3}$=

Answer 1

分析 根據(jù)小數(shù)及分?jǐn)?shù)的四則運(yùn)算的計(jì)算法則進(jìn)行計(jì)算，小數(shù)的加減要把小數(shù)點(diǎn)對(duì)齊，用分?jǐn)?shù)當(dāng)做計(jì)算的結(jié)果，注意化成最簡分?jǐn)?shù)．

解答

解：3.8+0.62=4.42	0.15×0.8=0.12	0.56÷0.7=0.8	20%×5%=0.01
$\frac{2}{3}$-0.5=$\frac{1}{6}$	$\frac{3}{4}$÷12=$\frac{1}{16}$	1.6+0.4×10=5.6	$\frac{1}{2}$×$\frac{1}{3}$÷$\frac{1}{2}$×$\frac{1}{3}$=$\frac{1}{9}$

點(diǎn)評(píng) 本題考查了小數(shù)及分?jǐn)?shù)的四則計(jì)算，要注意小數(shù)點(diǎn)的位置．