a ,b,c是三角形ABC三边,满足a方+b方+c方+50=6a+8b+10c,判断三角形ABC的形状.

问题描述:

a ,b,c是三角形ABC三边,满足a方+b方+c方+50=6a+8b+10c,判断三角形ABC的形状.

∵a^2+b^2+c^2+50=6a+8b+10c∴a^2+b^2+c^2-6a-8b-10c +50=0a^2-6a +9+b^2-8b+16 +c^2-10c +25=0(a-3)^2+ (b-4)^2+ (c-5)^2=0∵(a-3)^2≥0 (b-4)^2≥0 (c-5)^2≥0∴(a-3)^2=0 (b-4)^2=0 (c-5)^2=0...