Question

18．

直接寫出得數(shù)： 10-2.5=	1÷5=	0.27÷0.03=	0.32+1.68=
2.7×0.01=	6.4÷3.2=	0.29÷0.01=	0.8×0.5=
6.3÷0.9=	3.2-0.8=	0.25×40=	0.08×0.2=
0.54÷0.9=	0.125×8=	8-0.19=	8.7÷0.29=
1.7×0.6=	4.08÷0.2=	2.4+0.73=	1-0.57=

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．

解答 解：

10-2.5=7.5	1÷5=0.2	0.27÷0.03=9	0.32+1.68=2
2.7×0.01=0.027	6.4÷3.2=2	0.29÷0.01=29	0.8×0.5=0.4
6.3÷0.9=7	3.2-0.8=2.4	0.25×40=10	0.08×0.2=0.016
0.54÷0.9=0.6	0.125×8=1	8-0.19=7.81	8.7÷0.29=30
1.7×0.6=1.02	4.08÷0.2=20.4	2.4+0.73=3.13	1-0.57=0.43

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