1)
Why does the Torah use the double Lashon "Ki Hacharem Tacharimem"?
1.
Yerushalmi Avodah Zarah, 4:6: To teach us that, during the conquest of Cana'an 1 , they must be destroyed even if they negate their gods during the war.
1
See Torah Temimah, note 52.
2)
What is "Ka'asher Tzivcha Hashem" coming to include?
1.
Rashi: It includes the Girgashi. 1