a2+b2+c2+338=10a+24b+26ca2-10a+25+b2-24b+144+c2+26c+169=0(a-5)^2+(b-12)^2+(c-13)^2=0a=5 b=12 c=13所以a2+b2=c2所以是直角三角形，∠C=90°望采纳，谢谢啦~
