化简(a+2)(a-2)+3(a+2)²-6a(a+2)

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化简(a+2)(a-2)+3(a+2)²-6a(a+2)

化简(a+2)(a-2)+3(a+2)²-6a(a+2)
化简(a+2)(a-2)+3(a+2)²-6a(a+2)

化简(a+2)(a-2)+3(a+2)²-6a(a+2)
=(a+2)×[(a-2)+3(a+2)-6a]
=(a+2)×[a-2+3a+6-6a]
=(a+2)(4-2a)
=-2(a+2)(a-2)
=-2(a²-4)
=-2a²+8

原式=(a+2)[(a-2)+3(a+2)-6a]
=(a+2)(a-2+3a+6-6a)
=(a+2)(-2a+4)
=-2(a+2)(a-2)
=-2(a²-4)
=-2a²+8

提出一个(a 2)为
(a 2)(a-2 3a 6-6a)
=(a 2)(-2a 4)
=(a 2)(a-2)×(-2)
=-2×(a²-2²)
=-2a² 8
不懂可追问,望采纳

(a+2)(a-2)+3(a+2)(a+2)-6a(a+2)
(a+2)(a-2+3a+6-6a)
(a+2)(4-2a)
答案:2(a+2)(2-a)