Question

14．請(qǐng)直接寫(xiě)得數(shù)

1.5×4=	6.4÷0.8=	7.2×0.01=	10÷4=
0.36×2=	1÷0.125=	0.25×8=	8.1÷0.3=
0.1×0.02=	1.6÷16=	3.2÷1.6=	3×0.2×0.5=
12-6.2-3.8=	8×（2.5+0.25）=	2.56-0.37=	7×1.6+7×0.4=

Answer 1

分析 根據(jù)小數(shù)加、減、乘、除法的計(jì)算方法進(jìn)行計(jì)算，
3×0.2×0.5可根據(jù)乘法的結(jié)合律進(jìn)行簡(jiǎn)算，
12-6.3-3.8可根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)算，
8×（2.5+0.25）可根據(jù)乘法分配律進(jìn)行簡(jiǎn)算，
7×1.6+7×0.4可根據(jù)乘法分配律進(jìn)行簡(jiǎn)算．

解答 解：

1.5×4=6	6.4÷0.8=8	7.2×0.01=0.072	10÷4=2.5
0.36×2=0.72	1÷0.125=8	0.25×8=2	8.1÷0.3=27
0.1×0.02=0.002	1.6÷16=0.1	3.2÷1.6=2	3×0.2×0.5=0.3
12-6.2-3.8=2	8×（2.5+0.25）=22	2.56-0.37=2.19	7×1.6+7×0.4=14

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