题目内容
观察下面几组勾股数,并寻找规律:
①3,4,5;
②5,12,13;
③7,24,25;
请你写出以上规律的第④组勾股数:
①3,4,5;
②5,12,13;
③7,24,25;
请你写出以上规律的第④组勾股数:
9,40,41
9,40,41
.分析:先找出每组勾股数与其组数的关系,找出规律,再根据此规律进行解答.
解答:解:∵①3=2×1+1,4=2×12+2×1,5=2×12+2×1+1;
②5=2×2+1,12=2×22+2×2,13=2×22+2×2+1;
③7=2×3+1,24=2×32+2×3,25=2×32+2×3+1;
④9=2×4+1,40=2×42+2×4,41=2×42+2×4+1;
故答案为:9,40,41.
②5=2×2+1,12=2×22+2×2,13=2×22+2×2+1;
③7=2×3+1,24=2×32+2×3,25=2×32+2×3+1;
④9=2×4+1,40=2×42+2×4,41=2×42+2×4+1;
故答案为:9,40,41.
点评:本题考查的是勾股数,根据所给的每组勾股数找出各数与组数的规律是解答此题的关键.
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