题目内容
按规律填数.
(1)1,2,4,
(2)1,4,9,16,
(3)0,3,7,12,
(4)1,1,2,3,5,8,
(5)2,7,22,67,202,
(1)1,2,4,
8
8
,16;(2)1,4,9,16,
25
25
,36,49;(3)0,3,7,12,
18
18
,25,33;(4)1,1,2,3,5,8,
13
13
,21,34;(5)2,7,22,67,202,
607
607
.分析:(1)后一个数是前一个数的2倍;
(2)从1开始自然数的平方数;
(3)相邻两个数的差是逐渐增加,差为:3、4、5…;
(4)前两个数之和等于后面的数;
(5)后一个数总是前一个数的3倍多1.
(2)从1开始自然数的平方数;
(3)相邻两个数的差是逐渐增加,差为:3、4、5…;
(4)前两个数之和等于后面的数;
(5)后一个数总是前一个数的3倍多1.
解答:解:(1)4×2=8,即:
1,2,4,(8),16;
(2)52=25,即:
1,4,9,16,(25),36,49;
(3)12+6=18,即:
0,3,7,12,(18),25,33;
(4)5+8=13,即:
1,1,2,3,5,8,(13),21,34;
(5)202×3+1=607,即:
2,7,22,64,202,(607).
故答案为:8,25,18,13,607.
1,2,4,(8),16;
(2)52=25,即:
1,4,9,16,(25),36,49;
(3)12+6=18,即:
0,3,7,12,(18),25,33;
(4)5+8=13,即:
1,1,2,3,5,8,(13),21,34;
(5)202×3+1=607,即:
2,7,22,64,202,(607).
故答案为:8,25,18,13,607.
点评:先找到规律,再根据规律求解.
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