(3a^(n+2)b-2a^nb^(n-1)+3b^n)×5a^nb^n+3(n为正整数,n大于1)
问题描述:
(3a^(n+2)b-2a^nb^(n-1)+3b^n)×5a^nb^n+3(n为正整数,n大于1)
答
=15a^(2n+2)b^(n+4)-10a^2nb^(2n+2)+15a^nb^(2n+3)
(3a^(n+2)b-2a^nb^(n-1)+3b^n)×5a^nb^n+3(n为正整数,n大于1)
=15a^(2n+2)b^(n+4)-10a^2nb^(2n+2)+15a^nb^(2n+3)