(a+3)²-6(a+3)要过程,

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(a+3)²-6(a+3)要过程,

原式=(a+3)[(a+3-6)
=(a+3)(a-3)

(a+3)^2-6(a+3)
=(a+3)[(a+3)-6]
=(a+3)(a-3)
=a^2-9