Even if we consider the earliest possible date for Jewish slavery that the Bible suggests, the Jews had been enslaved in Egypt a good three hundred years after the 1750 B.C. completion date of the pyramids. That is, of course, if they were ever slaves in Egypt at all.
The reality is that there is no evidence whatsoever that the Jews were ever enslaved in Egypt. Yes, there's the story contained within the bible itself, but that's not a remotely historically admissible source. I'm talking about real evidence; archeological proof, state records and primary sources. Of these, nothing exists.
It is difficult to believe that 600,000 families (which would mean about two million people) crossed the entire Sinai without leaving one item of pottery with Hebrew writing on it. It is amazing that Egyptian records make no mention of the sudden migration of what would have been nearly a quarter of their population, nor has any evidence been found for any of the expected results of such an exodus; such as economic downturn or labor shortages. Furthermore, there is no evidence in Israel that illustrates an unexpected influx of people from another culture at that time. No rapid departure from traditional pottery has been noticed, no record or tale of a rise in population.
The truth is, there's simply no more evidence to indicate that the story is valid than there is in support of any of the Arab world's conspiracy theories and tall tales about Jews.