1*4+2*7+3*10+-------+(n+1)(3n+4)=?1*4+2*7+3*10+-------+(n+1)(3n+4)=要结果!
问题描述:
1*4+2*7+3*10+-------+(n+1)(3n+4)=?
1*4+2*7+3*10+-------+(n+1)(3n+4)=
要结果!
答
结果是:(n+1)(n+1)(n+3)