Question

直接寫(xiě)得數(shù)

0.25×3=	9.1÷1.3=	0.56×100=	4.5÷0.9=
1÷0.05=	3.3×0.4=	6.4÷0.08=	0.81÷0.9=
5.1÷1.7=	1×0.845=	15÷0.15=	4.2÷0.14=

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)算即可．

解答：解：0.25×3=0.75   9.1÷1.3=7    0.56×100=56    4.5÷0.9=5
1÷0.05=20    3.3×0.4=1.32    6.4÷0.08=80    0.81÷0.9=0.9
5.1÷1.7=3    1×0.845=0.845   15÷0.15=100   4.2÷0.14=30

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，能簡(jiǎn)算要簡(jiǎn)算．