(1)(2x-1)(4x2+1)(2x+1),=(4x2-1)(4x2+1),=16x4-1.(2)(2a-b+3)(2a-3+b),=[2a+(3-b)][2a-(3-b)],=4a2-(3-b)2,=4a2-b2+6b-9.(3) 4(a+2)2-7(a+3)(a-3)+3(a-1)2,=4(a2+4a+4)-7(a2-9)+3(a2-2a+1),=4a2+16a+16-7a2+63+3a2-6a+3,=10a+82.