3a的2次方-[5a-(a-3)+2a的2次方],
=3a的2次方-(5a-a+3+2a的2次方),
=3a的2次方-(4a+3+2a的2次方),
=3a的2次方-4a-3-2a的2次方
=a²-4a-3
=4+8-3
=9