(a^2+2a^3+3a^4)×a-(a^2+2a^3+3a^4)÷(-a)怎么做?

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(a^2+2a^3+3a^4)×a-(a^2+2a^3+3a^4)÷(-a)怎么做?
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(a^2+2a^3+3a^4)×a-(a^2+2a^3+3a^4)÷(-a)怎么做?
(a^2+2a^3+3a^4)×a-(a^2+2a^3+3a^4)÷(-a)怎么做?

(a^2+2a^3+3a^4)×a-(a^2+2a^3+3a^4)÷(-a)怎么做?
(a²+2a³+3a^4)×a-(a²+2a²+3a^4)÷(-a)
=a³(1+2a+3a²)+(a+2a+3a³)=a³(1+2a+3a²)+a(1+2a+3a²)
=(1+2a+3a²)(a³+a)=a(a²+1)(1+2a+3a²)

(a^2+2a^3+3a^4)×a-(a^2+2a^3+3a^4)÷(-a)
=a^3+2a^4+3a^5+a-2a^2-3a^3
=-2a^3+2a^4+3a^5+a-2a^2