(a+3)²-6(a+3)要过程,
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(a+3)²-6(a+3)要过程,(a+3)²-6(a+3)要过程,(a+3)²-6(a+3)要过程,原式=(a+3)[(a+3-6)=(a+3)(a-3)(a+3)^2
(a+3)²-6(a+3)要过程,
(a+3)²-6(a+3)要过程,
(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