Question

20．直接寫出得數(shù)

0.12×2=	0.36÷0.9=	2.5×0.4=	4.2÷0.6=
3.2×0.2=	0.56×100=	0.87÷0.01=	5.4÷9=
0.32÷0.08=	0.2×0.08=	5÷7=	0.82=
0.23=	17÷6=	$\frac{4}{6}-\frac{2}{6}$=	$\frac{1}{4}+\frac{1}{3}$=
$\frac{6}{7}+\frac{2}{7}$=	$\frac{7}{9}-\frac{4}{9}$=	$\frac{8}{7}+\frac{6}{7}$=

Answer 1

分析 根據(jù)小數(shù)和分?jǐn)?shù)加減乘除法運算的計算法則計算即可求解．

解答 解：

0.12×2=0.24	0.36÷0.9=0.4	2.5×0.4=1	4.2÷0.6=7
3.2×0.2=0.64	0.56×100=56	0.87÷0.01=87	5.4÷9=0.6
0.32÷0.08=4	0.2×0.08=0.016	5÷7=$\frac{5}{7}$	0.82=0.64
0.23=0.008	17÷6=2$\frac{5}{6}$	$\frac{4}{6}-\frac{2}{6}$=$\frac{1}{3}$	$\frac{1}{4}+\frac{1}{3}$=$\frac{7}{12}$
$\frac{6}{7}+\frac{2}{7}$=$\frac{8}{7}$	$\frac{7}{9}-\frac{4}{9}$=$\frac{1}{3}$	$\frac{8}{7}+\frac{6}{7}$=2

點評 考查了小數(shù)和分?jǐn)?shù)加減乘除法運算，關(guān)鍵是熟練掌握計算法則正確進(jìn)行計算．