=[(2a-1)(2a+1)]²-(5a-2)²+(5a+2)²
=(4a²-1)²-[(5a-2)²-(5a+2)²]
=(4a²-1)²-(5a-2+5a+2)(5a-2-5a-2)
=(4a²-1)²-10a×(-4)
=(4a²-1)²+40a
当a=-2时
原式=(4×4-1)²+40×(-2)
=145
=[(2a-1)(2a+1)]²-(5a-2)²+(5a+2)²
=(4a²-1)²-[(5a-2)²-(5a+2)²]
=(4a²-1)²-(5a-2+5a+2)(5a-2-5a-2)
=(4a²-1)²-10a×(-4)
=(4a²-1)²+40a
当a=-2时
原式=(4×4-1)²+40×(-2)
=145