(a+1)(a+2)(a-3)计算

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(a+1)(a+2)(a-3)计算(a+1)(a+2)(a-3)计算(a+1)(a+2)(a-3)计算(a+1)(a+2)(a-3)=(a²+2a+a+2)(a-3)=(a²+3a

(a+1)(a+2)(a-3)计算
(a+1)(a+2)(a-3)计算

(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
互相帮助

=(a∧2+3a+2)(a-3)=a∧3-7a-6

(a+1)(a+2)(a-3)=(a^2+3a+2)(a-3)=a^3+3a^2+2a-3a^2-9a-6=a^3-7a-6