(3a的n+3次方-9a的n次方+5a的n+1次方-2a的n次方)-(-a的n次方+10a的n+3次方-5a的n+1次方-7a的n+2次方)的过程
感谢
快哦!
(3a的n+3次方-9a的n次方+5a的n+1次方-2a的n次方)-(-a的n次方+10a的n+3次方-5a的n+1次方-7a的n+2次方)的过程
感谢
快哦!
[3a^(n+3)-9a^n+5a^(n+1)-2a^n]-[-a^n+10a^(n+3)-5a^(n+1)-7a^(n+2)]
=3a^(n+3)-9a^n+5a^(n+1)-2a^n+a^n-10a^(n+3)+5a^(n+1)+7a^(n+2)
=-7a^(n+3)+10a^(n+1)-10a^n+7a^(n+2)