极限3n^2-5/2n^2+n

极限3n^2-5/2n^2+n
极限3n^2-5/2n^2+n

极限3n^2-5/2n^2+n
上下同除n^2
极限3n^2-5/2n^2+n
=极限(3-5/n^2)/(2+1/n)
然后商法则,分别取极限
=极限(3-5/n^2)/极限(2+1/n)
=(3-0)/(2+0)
=3/2

同志 极限n趋近于什么啊？

没加括号吗?