Question

7．口算．

0.2×0.5=	0.27-0.2=	0.8×0.7=	3.6÷0.12=
0.05×1.6=	0.32×0.5=	1.2÷0.5=	0.3×0.3=
0.1×0.98=	0.33÷0.11=	2.8×1000=	0.51÷0.17=
0.75×8=	0.24÷0.6=	0.4×0.55=	1.21÷0.1=

Answer 1

分析 根據(jù)小數(shù)加減乘除的計(jì)算方法進(jìn)行計(jì)算即可．

解答 解：

0.2×0.5=0.1	0.27-0.2=0.07	0.8×0.7=0.56	3.6÷0.12=30
0.05×1.6=0.8	0.32×0.5=0.15	1.2÷0.5=24	0.3×0.3=0.09
0.1×0.98=0.098	0.33÷0.11=3	2.8×1000=2800	0.51÷0.17=3
0.75×8=6	0.24÷0.6=0.4	0.4×0.55=0.22	1.21÷0.1=12.1

點(diǎn)評 口算時(shí)，注意運(yùn)算符號和數(shù)據(jù)，然后再進(jìn)一步計(jì)算即可．