>>984
[1]
a=b=c=1 のとき?


[2]
(aa+3)(bb+3)=(ab-1)^2 +(3aa+2ab+3bb)+ 8
=(ab-1)^2 + (a-b)^2 + 2(a+b)^2 + 8
=(ab-1)^2 + (a-b)^2 + 2(a+b-2)^2 +8(a+b),