a²+b²+c²-10a-8b-6c+50=0a²-10a+25+b²-8b+16+c²-6c+9=0(a-5)²+(b-4)²+(c-3)²=0因为(a-5)² (b-4)² (c-3)²都是大于等于零的所以(a-5)²=(b-4)²...