What are the connotations of "Re'ei, Nasati lachem ... "?
Rashi: 'You can see with your own eyes! 1 I am not concocting it'.
Though it is not clear what they were supposed to see. Refer to 1:21:151:1 & 2.
What are the implications of "Bo'u u'Reshu es ha'Aretz"?
Rashi: It implies that the Cana'anim would all flee, and they would conquer the land without raising a sword.
Ramban: It implies that conquering Eretz Yisrael is (not a promise, but) a Mitzvah. 1
Seforno: It implies that the Cana'anim were too afraid of Yisrael to defend themselves.
Refer to Bamidbar, 33:53:1:1, 2.
Having said "la'Avoseichem", why does the Torah need to add "le'Avraham, le'Yitzchak u'le'Ya'akov"?
Rashi: To teach us that each of the Avos was worthy [to receive Eretz Yisrael and bequeath it to his descendants]. 1
And not only on their combined merits.
Who is "Laseis lahem" referring to?
Sanhedrin, 90b: It refers to the Avos and is a proof for Techi'as ha'Meisim.
