1+a²b²-a²-b²4ab,因式分解
问题描述:
1+a²b²-a²-b²4ab,因式分解
答
1+a²b²-a²-b²-4ab
=1+a²b²-a²-b²-2ab-2ab
=(ab-1)^2-(a-b)^2
=(ab+a-b-1)(ab-a+b-1)
=(a-1)(b+1)(a+1)(b-1)