Upvote:2
Ressurection is mentioned many times in the Bible. Job also said "And after my skin has been destroyed, yet in my flesh I will see God" (Job 19:26).
According to this article, the Sadducees based their doctrine only from the Torah(Pentateuch), rejecting all Jewish Oral Laws and gave no importance to the writing of the Prophets.
In Matthew 22:23-33, Sadducees wanted to test Jesus on the topic of resurrection. Knowing that they accepted only the Pentateuch, Jesus replied them from the Pentateuch itself that resurrection is mentioned(perhaps indirectly). This reply from Jesus silenced the Sadducees.
Hearing that Jesus had silenced the Sadducees, the Pharisees got together. One of them, an expert in the law, tested him with this question: (Matthew 22: 34-35, NIV)
Their silence would probably mean that Jesus was quoting correctly from the same Scripture that Sadducees were reading. Otherwise they should have argued about the tense used in the Scripture like the one you mentioned from the Samaritan Pentateuch. Also there was no reason why Sadducees would read from the Samaritan Pentateuch because Jews at that time abhorred the Samaritans.
So, to answer your question, "Is the Doctrine of Resurrection of the Dead expressed in Pentateuch?", the answer is definitely YES! according to Jesus or Christian Scripture. But if you ask "Is it mentioned in the Samaritan Pentateuch?", the answer could be 'No' but I think that is irrelevant for Christians because our Scripture is different from what the Samaritans have.