The problem with giving every child a computer isn't them having the computer, but all the costs associated with it like internet access. And a safe place to store said computer. Probably for a non-zero portion of the students that cannot afford a computer and internet access for it, the computer would be taken by the parents and sold for some quick cash.
I like the idea of a set of elementary school textbooks nationwide, but who gets to decide on their content? Right now, its the largest states (California, Texas, Florida, New York) that determine nearly all the content for the rest of the nation by virtue of their student population and buying power.
And you'll have to buy them again every couple of times a decade. Mostly because elementary school covers more than just the "three 'r's". I distinctly remember learning history (state and country), as well as government, science, and current events in addition to readin, ritin, and rithmatic.