3,4,5 5,12,13 7,24,25 9,40,41 11,60,61 2n+1,2n^2+2n,2n^2+2n+1(n为正整数).a=n+1,b=n-1,c^=2(n^+1) a=n^-1,b=2n,c=n^+1 a=m^-n^,b=2mn,c=m^+n^ a=2n+1,b=2n(n+1),c=2n(n+1)+1请直接说...........谢谢21220221