读拼音，猜谜语，做练习。    

tóu fà pī jiān shén qì  ào,     

wěi ba yì shuǎi shēn hòu qiào。     

zhāng dà zuǐ ba yì shēng hǒu,   

lǎo hǔ  yě yào xià yí tiào。    

                             (dá yí dòng wù)  

1．这只动物是                      。   

2．找音节送到相应的括号里。

翘舌音                                                         

三拼音                                                         

设一元二次方程x²-7x+3=0的两个实数根分别为x₁和x₂，则x₁+x₂=______，x₁x₂=______．