太简单了吧
10咯!(3a2-2ab-b2)-(a2-2ab-3b2)=2(a2+b2)=10!!!
(3a²-2ab-b²)-(a²-2ab-3b²)
=3a²-2ab-b²-a²+2ab+3b²
=2a²+2b²
=2(a²+b²)
=2*5
=10
(3a²-2ab-b²)-(a²-2ab-3b²)
=3a²-2ab-b²-a²+2ab+3b²
=2a²+2b²
=2(a²+b²)
=2×5
=10
(3a²-2ab-b²)-(a²-2ab-3b²)
=2a²+2b²
=2(a²+b²)
=10