Question

20．直接寫出得數(shù)．

27+68=	910-540=	18×40=	910÷70=
75-0.8=	2÷7=	6.3÷0.2=	36×25%=
$\frac{9}{4}$+$\frac{3}{4}$=	3-$\frac{2}{5}$=	$\frac{5}{6}$×$\frac{3}{5}$=	$\frac{1}{2}$÷$\frac{1}{4}$=
3.48+6.52=	1.02-0.43=	0.25×0.8=	12.6÷3=

Answer 1

分析 根據(jù)整數(shù)、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36×25%變形為9×（4×25%）計(jì)算，0.25×0.8變形為0.25×0.4×2計(jì)算．

解答 解：

27+68=95	910-540=370	18×40=720	910÷70=13
75-0.8=74.2	2÷7=$\frac{2}{7}$	6.3÷0.2=31.5	36×25%=9
$\frac{9}{4}$+$\frac{3}{4}$=3	3-$\frac{2}{5}$=2.6	$\frac{5}{6}$×$\frac{3}{5}$=$\frac{1}{2}$	$\frac{1}{2}$÷$\frac{1}{4}$=2
3.48+6.52=10	1.02-0.43=0.59	0.25×0.8=0.2	12.6÷3=4.2

點(diǎn)評(píng) 考查了整數(shù)、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．