Question

2．算一算：

8.2+4.08=	1-0.72=	0.4×0.025=	7-0.71-0.29=
8.1÷0.03=	0.24×4=	7.2÷2.4=	0.9÷0.01=
6.3+7=	4.8÷0.08=	9+0.1=	3-0.67-0.33=
0.08÷0.2=	0.2×0.4=	1÷0.05=	0+2÷5=
0.081×100=	7.96×10=	40萬(wàn)-13萬(wàn)=	0.45+3.5+.055=
1-0.1=	0.31+0.3=	0.72÷1.2=	0.05×1=
4.2+5.08=	7.2÷0.072=	4.3-3=	0.75÷1.5=
1.05-0.95=	2.5×4=	2.5×2.4=	3.2-1.34-1.66=
12.8-0.28=	1.25×0.8=	5.6-5.6÷7=	3.60.7÷3.6×0.7=
0.8+0.2-0.8+0.2=	1÷1.25÷4=	8.4×5=	0×9.56+7.2=

Answer 1

分析 根據(jù)小數(shù)加減乘除法的計(jì)算方法求解；
7-0.71-0.29，3-0.67-0.33，3.2-1.34-1.66根據(jù)減法的性質(zhì)簡(jiǎn)算；
3.6×0.7÷3.6×0.7根據(jù)乘法交換律和結(jié)合律簡(jiǎn)算；
0.8+0.2-0.8+0.2根據(jù)加法交換律和結(jié)合律簡(jiǎn)算．

解答 解：

8.2+4.08=12.28	1-0.72=0.28	0.4×0.025=0.01	7-0.71-0.29=6
8.1÷0.03=270	0.24×4=0.96	7.2÷2.4=3	0.9÷0.01=90
6.3+7=13.3	4.8÷0.08=60	9+0.1=9.1	3-0.67-0.33=2
0.08÷0.2=0.4	0.2×0.4=0.08	1÷0.05=20	0+2÷5=0.4
0.081×100=8.1	7.96×10=79.6	40萬(wàn)-13萬(wàn)=27萬(wàn)	0.45+3.5+0.55=4.5
1-0.1=0.9	0.31+0.3=0.61	0.72÷1.2=0.6	0.05×1=0.05
4.2+5.08=9.28	7.2÷0.072=100	4.3-3=1.3	0.75÷1.5=0.5
1.05-0.95=0.2	2.5×4=10	2.5×2.4=6	3.2-1.34-1.66=0.2
12.8-0.28=12.52	1.25×0.8=1	5.6-5.6÷7=4.8	3.6×0.7÷3.6×0.7=0.49
0.8+0.2-0.8+0.2=0.4	1÷1.25÷4=0.2	8.4×5=42	0×9.56+7.2=7.2

點(diǎn)評(píng) 本題考查了簡(jiǎn)單的運(yùn)算，要注意根據(jù)運(yùn)算法則和運(yùn)算定律快速準(zhǔn)確的得出答案．