【答案】三,純循環(huán),0.![](http://thumb.zyjl.cn/questionBank/Upload/2018/01/23/23/cf3804bc/SYS201801232336149460526289_DA/SYS201801232336149460526289_DA.001.png)
,0.7,0.73
【解析】
試題分析:(1)本題可根據(jù)小乘乘法的運(yùn)算法則進(jìn)行分析選擇;
(2)先計(jì)算出8÷11的商,然后再由小數(shù)分類的方法判斷;
(3)找出循環(huán)節(jié),在它的上面點(diǎn)上點(diǎn)即可;
(4)保留小數(shù)的位數(shù)要用“四舍五入“法來取值.
解:(1)乘法算式3.78×0.25中的兩個(gè)因數(shù)都是兩位小數(shù),
則它們的積的精確值應(yīng)是2+2=4位小數(shù),
由于3.78×0.25=0.9450,末尾的0一般要去掉,則它們的積是0.945,即是三位小數(shù).
(2)8÷11=0.727272…,循環(huán)節(jié)是從十分位開始的,屬于純循環(huán)小數(shù).
(3)8÷11=0.727272…,用循環(huán)小數(shù)的簡便記法表示商是0.![](http://thumb.zyjl.cn/questionBank/Upload/2018/01/23/23/cf3804bc/SYS201801232336149460526289_DA/SYS201801232336149460526289_DA.001.png)
.
(4)保留一位小數(shù)是(0.7),保留兩位小數(shù)是(0.73);
故答案為:三,純循環(huán),0.![](http://thumb.zyjl.cn/questionBank/Upload/2018/01/23/23/cf3804bc/SYS201801232336149460526289_DA/SYS201801232336149460526289_DA.001.png)
,0.7,0.73.