Question

16．直接寫(xiě)出得數(shù)．

8.8÷1.1=	3.55+4.5=	3.8÷0.01=	0.25×3×4=
0.5×0.07=	4.01-3.99=	8×0.5=	0÷2.8×0.1=

Answer 1

分析 ①根據(jù)商不變的規(guī)律，把被除數(shù)和除數(shù)分別擴(kuò)大10倍即可；②⑥小數(shù)點(diǎn)對(duì)齊；③根據(jù)商不變的規(guī)律，把被除數(shù)和除數(shù)分別擴(kuò)大100倍即可；④運(yùn)用乘法交換律和結(jié)合律簡(jiǎn)算；⑤先算5×7，然后點(diǎn)上小數(shù)點(diǎn)即可；⑦先算8×5，然后點(diǎn)上小數(shù)點(diǎn)即可；⑧0除以任何非零的數(shù)都得0，0乘任何數(shù)都得0．

解答 解：

8.8÷1.1=8	3.55+4.5=8.05	3.8÷0.01=380	0.25×3×4=3
0.5×0.07=0.035	4.01-3.99=0.02	8×0.5=4	0÷2.8×0.1=0

點(diǎn)評(píng) 完成小數(shù)加減法時(shí)要注意小數(shù)點(diǎn)對(duì)齊，完成小數(shù)乘除法時(shí)要注意小數(shù)點(diǎn)位置的變化．