(x-2)²-3(x+2)(2-x)
=(x-2)²+3(x+2)(x-2)
=(x-2)[(x-2)+3(x+2)]
=(x-2)(4x+4)
=4(x-2)(x+1)
a²b²(a+b)-10ab(a+b)+25(a+b)
=(a+b)(a²b²-10ab+25)
=(a+b)(ab-5)²
若还不清楚欢迎追问,懂了请及时采纳 !