(1)设十位上的数为x
(10x+6)^2-(10x+3)^2=327
(10x+6+10x+3)(10x+6-10x+3)=327
(10x+6+10x+3)*3=327
x=5
(2)a(2)+2b(2)+c(2)-2ab-2bc=0
a^2-2ab+b^2+b^2-2bc+c^2=0
(a-b)^2+(b-c)^2=0
(a-b)^2=0 (b-c)^2=0
a=b=c 等边三角形
(1)设十位上的数为x
(10x+6)^2-(10x+3)^2=327
(10x+6+10x+3)(10x+6-10x+3)=327
(10x+6+10x+3)*3=327
x=5
(2)a(2)+2b(2)+c(2)-2ab-2bc=0
a^2-2ab+b^2+b^2-2bc+c^2=0
(a-b)^2+(b-c)^2=0
(a-b)^2=0 (b-c)^2=0
a=b=c 等边三角形