n+2=√(9+n²+2n+1) ..

来源：学生作业帮助网编辑：六六作业网时间：2024/05/21 02:17:06

n+2=√(9+n²+2n+1)..n+2=√(9+n²+2n+1)..n+2=√(9+n²+2n+1)..n+2=√(9+n²+2n+1)（n+2）²

n+2=√(9+n²+2n+1) ..
n+2=√(9+n²+2n+1) ..

n+2=√(9+n²+2n+1) ..
n+2=√(9+n²+2n+1)
（n+2）²=9+n²+2n+1
n²+4n+4=9+n²+2n+1
n²+4n+4-9-n²-2n-1=0
2n-6=0
2n=6
n=3