求和∑上面是10,下面是k=0(3+0.25k)
问题描述：
求和∑上面是10,下面是k=0(3+0.25k)
答
=(3+0.25*0)+(3+0.25*1)+……+(3+0.25*10)
=3*11+0.25*(0+1+……+10)
=33+0.25*55
=46.75