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=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.
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