(3a的n+3次方+6a的n+2次方-9a的n+1次方)÷3a的n-1次方

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(3a的n+3次方+6a的n+2次方-9a的n+1次方)÷3a的n-1次方

(3a的n+3次方+6a的n+2次方-9a的n+1次方)÷3a的n-1次方
(3a的n+3次方+6a的n+2次方-9a的n+1次方)÷3a的n-1次方

(3a的n+3次方+6a的n+2次方-9a的n+1次方)÷3a的n-1次方
(3a的n+3次方+6a的n+2次方-9a的n+1次方)÷3a的n-1次方 =3a的n-1次方*(a4次方+2a3次方-3a2次方)÷3a的n-1次方 =a2次方*(a-3)(a+1)