a²-4/2ab×4a²b+8ab/a²+4a﹢4

问题描述:

a²-4/2ab×4a²b+8ab/a²+4a﹢4

(a²-4)/(2ab) × (4a²b + 8ab)/(a²+4a﹢4)
=(a+2)(a-2) / (2ab) * (4ab)(a+2)/(a+2)²
=2(a-2)