(a+1)(a+2)(a-3)计算

问题描述:

(a+1)(a+2)(a-3)计算

(a+1)(a+2)(a-3)
=(a²+2a+a+2)(a-3)
=(a²+3a+2)(a-3)
=a三次方-3a²+3a²-9a+2a-6
=a三次方-7a-6
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