Question

计算(a+1)(a+2)(a+3)(a-6)

Answer 1

(a+1)(a+2)(a+3)(a-6)

=[(a+1)(a-6)] [(a+2)(a+3)]

=(a²-5a-6)（a²+5a+6）

=（a²）²-（5a+6）²

=a^4-25a²-60a-36

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