阅读下面的诗文，回答相关问题。

                                                                                                                                        社 日①
                                                                                                                                         张 演
                                                                                                              鹅湖山下稻粱肥，豚栅鸡栖对掩扉。
                                                                                                              桑柘影斜春社散，家家扶得醉人归。
     【注释】①古代祭祀土神的日子，春秋两祭，分为春社和秋社。②豚栅（tún zhà）：小猪猪圈。

$\frac{1}{\sqrt{2}+1}$ = $\frac{1\times \left(\sqrt{2}-1\right)}{\left(\sqrt{2}+1\right)\left(\sqrt{2}-1\right)}$ = $\sqrt{2}$ ﹣1；

$\frac{1}{\sqrt{3}+\sqrt{2}}$ = $\frac{1\times \left(\sqrt{3}-\sqrt{2}\right)}{\left(\sqrt{3}+\sqrt{2}\right)\left(\sqrt{3}-\sqrt{2}\right)}$ = $\sqrt{3}$ ﹣ $\sqrt{2}$ ；

$\frac{1}{\sqrt{5}+2}$ = $\frac{1\times \left(\sqrt{5}-2\right)}{\left(\sqrt{5}+2\right)\left(\sqrt{5}-2\right)}$ = $\sqrt{5}$ ﹣2．

试求：

看图片，写单词。

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