分析:(1)把百分數(shù)化小數(shù),只要去掉百分號,同時把小數(shù)點向左移動兩位即可;把百分數(shù)化分數(shù),先把百分數(shù)寫成分數(shù)的形式,再根據(jù)分數(shù)的基本性質(zhì)進一步化簡成最簡分數(shù).
(2)把小數(shù)化成百分數(shù),只要把小數(shù)點向右移動兩位,同時添上百分號即可;把小數(shù)化分數(shù),一位小數(shù)表示十分之幾,兩位小數(shù)表示百分之幾,三位小數(shù)表示千分之幾…先寫成分數(shù)的形式,再進一步化簡成最簡分數(shù).
(3)把分數(shù)化百分數(shù),先用分數(shù)的分子除以分母得出小數(shù)商,除不盡時通常保留三位小數(shù),再把小數(shù)點向右移動兩位,同時填上百分號;把分數(shù)化小數(shù),用分數(shù)的分子除以分母即得小數(shù)商,除不盡時通常保留三位小數(shù).
解答:解:35%=0.35,35%=
=
;
1.4=140%,1.4=
=
;
=5÷6≈0.833=83.3%;
0.275=27.5%,0.275=
=
;
0.2%=0.002,0.2%=
=
.
見下圖:
百分數(shù) |
35% |
140% |
83.3% |
27.5% |
0.2% |
小數(shù) |
0.35 |
1.4 |
0.833 |
0.275 |
0.002 |
分數(shù) |
|
|
|
|
|
故答案為:140%,83.3%,27.5%,0.35,0.833,0.002,
,
,
,
.
點評:此題考查分數(shù)與小數(shù)、百分數(shù)互化方法的靈活運用,熟記化法是解題關(guān)鍵.