1,1.1,1.3,1.6
2
2
,
2.5
2.5
,3.1,
3.8
3.8
分析:1.1-1=0.1,
1.3-1.1=0.2,
1.6-1.3=0.3,
后一個數(shù)比前一個數(shù)分別多0.1,0.2,0.3…依次增加0.1,由此求解.
解答:解:0.3+0.1=0.4,
1.6+0.4=2;
0.4+0.1=0.5,
2+0.5=2.5;
0.5+0.1+0.1=0.7,
3.1+0.7=3.8;
這個數(shù)列就是:1,1.1,1.3,1.6 2,2.5,3.1,3.8.
故答案為:2,2.5,3.8.
點評:本題關鍵是找出相鄰兩個數(shù)之間差的變化規(guī)律,再根據(jù)差的變化進行求解.
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