已知a(a-1)+(b-a²)=﹣4,求(a²+b²)÷2-ab
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已知a(a-1)+(b-a²)=﹣4,求(a²+b²)÷2-ab
已知a(a-1)+(b-a²)=﹣4,求(a²+b²)÷2-ab
已知a(a-1)+(b-a²)=﹣4,求(a²+b²)÷2-ab
a(a-1)+(b-a²)=﹣4
a²-a+b-a²=-4
-a+b=-4
a-b=4
(a²+b²)÷2-ab
=(a²-2ab+b²)/2
=(a-b)²/2
=4²/2
=8