已知a(a-1)-(a*a-b)=8,求a*a+b*b/2-ab的值

已知a(a-1)-(a*a-b)=8,求a*a+b*b/2-ab的值

a^2-a-a*a+b=8;
b-a=8;
b^2-2ab+a^2=64;
(a*a+b*b)/2-ab=(b^2-2ab+a^2)/2=32