第十六题
![Mathematica入门习题[16]–再探函数](https://img.mathpretty.com/snipaste_20170912_215446.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)
f[x_] := x + 10*Log[x^2 + 5];
f[40]/(f[30] + f[20]) // N
![Mathematica入门习题[16]–再探函数](https://img.mathpretty.com/snipaste_20170912_221221.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)
f[n_] := Sum[x*(x + 1), {x, 1, n}];
f[40]/(f[30] + f[20]) // N
![Mathematica入门习题[16]–再探函数](https://img.mathpretty.com/snipaste_20170912_221225.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[16]–再探函数](https://img.mathpretty.com/snipaste_20170912_215446.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)
f[x_] := x + 10*Log[x^2 + 5];
f[40]/(f[30] + f[20]) // N
![Mathematica入门习题[16]–再探函数](https://img.mathpretty.com/snipaste_20170912_221221.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)
f[n_] := Sum[x*(x + 1), {x, 1, n}];
f[40]/(f[30] + f[20]) // N
![Mathematica入门习题[16]–再探函数](https://img.mathpretty.com/snipaste_20170912_221225.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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