a
b
c
3
4
5
8
6
10
15
17
24
26
…
x
14
y
① , 2,3;②3,4,7;③7,12,13;④8,15,17;⑤9,40,41.
①如图1,求点A、B、C和点P的坐标;
②如图2,当时,求点M的坐标;
3,4,5;
9,40,41;
5,12,13;
……
7,24,25;
, , .
请解答: