（1）lim （3n^2-2n+1）/（8-n^3）
＝lim(3-2/n+1/n^2) /(8/n^2-n)
=0
(2)lim (1+2+3+…+n)/n^2
=limn*(n+1)/2*n^2
=1/2
求下列极限：（1）lim 3n^2-2n+1/8-n^3 n→∞ (2)lim 1+2+3+…+n/n^2 n→∞
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