第二十八题
![Mathematica入门习题[28]–级数求和(Sum的使用)](https://img.mathpretty.com/snipaste_20170912_165404.png?imageView2/0/q/75|watermark/2/text/5YWz5rOo5YWs5LyX5Y-377ya5paH6Im65pWw5a2m5ZCb/font/5b6u6L2v6ZuF6buR/fontsize/540/fill/IzAwMDAwMA==/dissolve/100/gravity/SouthEast/dx/10/dy/10|imageslim)
Sum[1/(2*n - 1), {n, 1, 10}] // N
![Mathematica入门习题[28]–级数求和(Sum的使用)](https://img.mathpretty.com/snipaste_20170912_210922.png?imageView2/0/q/75|watermark/2/text/5YWz5rOo5YWs5LyX5Y-377ya5paH6Im65pWw5a2m5ZCb/font/5b6u6L2v6ZuF6buR/fontsize/540/fill/IzAwMDAwMA==/dissolve/100/gravity/SouthEast/dx/10/dy/10|imageslim)
Sum[n^2*x^(n - 1), {n, 1, Infinity}]
![Mathematica入门习题[28]–级数求和(Sum的使用)](https://img.mathpretty.com/snipaste_20170912_210940.png?imageView2/0/q/75|watermark/2/text/5YWz5rOo5YWs5LyX5Y-377ya5paH6Im65pWw5a2m5ZCb/font/5b6u6L2v6ZuF6buR/fontsize/540/fill/IzAwMDAwMA==/dissolve/100/gravity/SouthEast/dx/10/dy/10|imageslim)
Sum[n^2/5^n, {n, 1, Infinity}]
![Mathematica入门习题[28]–级数求和(Sum的使用)](https://img.mathpretty.com/snipaste_20170912_210955.png?imageView2/0/q/75|watermark/2/text/5YWz5rOo5YWs5LyX5Y-377ya5paH6Im65pWw5a2m5ZCb/font/5b6u6L2v6ZuF6buR/fontsize/540/fill/IzAwMDAwMA==/dissolve/100/gravity/SouthEast/dx/10/dy/10|imageslim)
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![Mathematica入门习题[28]–级数求和(Sum的使用)](https://img.mathpretty.com/snipaste_20170912_165404.png?imageView2/0/q/75|watermark/2/text/5YWz5rOo5YWs5LyX5Y-377ya5paH6Im65pWw5a2m5ZCb/font/5b6u6L2v6ZuF6buR/fontsize/540/fill/IzAwMDAwMA==/dissolve/100/gravity/SouthEast/dx/10/dy/10|imageslim)
Sum[1/(2*n - 1), {n, 1, 10}] // N
![Mathematica入门习题[28]–级数求和(Sum的使用)](https://img.mathpretty.com/snipaste_20170912_210922.png?imageView2/0/q/75|watermark/2/text/5YWz5rOo5YWs5LyX5Y-377ya5paH6Im65pWw5a2m5ZCb/font/5b6u6L2v6ZuF6buR/fontsize/540/fill/IzAwMDAwMA==/dissolve/100/gravity/SouthEast/dx/10/dy/10|imageslim)
Sum[n^2*x^(n - 1), {n, 1, Infinity}]
![Mathematica入门习题[28]–级数求和(Sum的使用)](https://img.mathpretty.com/snipaste_20170912_210940.png?imageView2/0/q/75|watermark/2/text/5YWz5rOo5YWs5LyX5Y-377ya5paH6Im65pWw5a2m5ZCb/font/5b6u6L2v6ZuF6buR/fontsize/540/fill/IzAwMDAwMA==/dissolve/100/gravity/SouthEast/dx/10/dy/10|imageslim)
Sum[n^2/5^n, {n, 1, Infinity}]
![Mathematica入门习题[28]–级数求和(Sum的使用)](https://img.mathpretty.com/snipaste_20170912_210955.png?imageView2/0/q/75|watermark/2/text/5YWz5rOo5YWs5LyX5Y-377ya5paH6Im65pWw5a2m5ZCb/font/5b6u6L2v6ZuF6buR/fontsize/540/fill/IzAwMDAwMA==/dissolve/100/gravity/SouthEast/dx/10/dy/10|imageslim)
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