(5a²-3b²)-3(a²-b²)-(-b²),其中a=3,b=-2化简

(5a²-3b²)-3(a²-b²)-(-b²),其中a=3,b=-2化简
(5a²-3b²)-3(a²-b²)-(-b²),其中a=3,b=-2化简

(5a²-3b²)-3(a²-b²)-(-b²),其中a=3,b=-2化简
(5a²-3b²)-3(a²-b²)-(-b²)
=5a²-3b²-3a²+3b²+b²
=(5a²-3a²)+(3b²-3b²+b²)
=2a²+b²
=2x(3)²+(-2)²
=18+4
=22

=2a²-3a²-3b²+b²
=-2b²-a²