化简求值[﹙a+1/2b)^2-(a-1/2b)^2](2a-1/2b)(1/2b+2a)(1/4b^2+4a^2)(其中a=-1,b=2)

原式= [(a+1/2b+a-1/2b)(a+1/2b-a+1/2b)]²(4a²-1/4b²)(4a²+1/4b²)= [2ab]²(16a^4-1/16b^4)= 64a^6b² - 1/4a²b^6= 64×(-1)^6×2² - 1/4×(-1)²×2^6= 256 - 16= ...