1. a³+4a²b+4ab² =a(a²+4ab+4b²) =a(a+2b)² 2.2a²-b²/8 =1/8(16a²-b²) =1/4(4a+b)(4a-b)3.a²(x-y)+b²(y-x) =a²(x-y)-b²(x-y) =(a²-b²)(x-y) =(a+b)(a-b)(x-y)
3,(a+b)(a-b)(x-y)
