x²+y²-2xy-6x+6y+9=0
(x-y)²-6(x-y)+9=0
(x-y)²-2×(x-y)×3+3²=0
[(x-y)-3]²=0
(x-y-3)²=0
x-y-3=0
x-y=3不明白把 x-y看做aa²-6a+9=0(a-3)²=0(x-y-3)²=0