(4a+2b-1)(4a-2b+1)
=[4a+(2b-1)][4a-(2b-1)]
=(4a)^2-(2b-1)^2
=16a^2-4b^2+4b-1
(4a+2b-1)^2-(4a-2b+1)^2
=[(4a+2b-1)+(4a-2b+1)][(4a+2b-1)-(4a-2b+1)]
=(8a)(4b-2)
=32ab-16a
(4a+2b-1)(4a-2b+1）(4a+2b-1)^2-(4a-2b+1)^2
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