Which laptop should a student choose?

Question

laptops

I recently broke my ultrabook, and therefore the question arose of replacing it. I'm studying programming and mathematics, I don't play games, I carry my laptop with me all the time. I would like to keep within 30-40k, 50k is the upper limit. Main criteria:
1) autonomy - 8 hours (not less than 5)
2) RAM (8/4+ free slot)
3) diagonal 13-15 (if possible with normal screen resolution)
4) weight no more than 2.5 kg
5) disk not less than 256 GB
In general - an autonomous laptop that does not lag on 50 browser tabs and is not problematic to carry in a backpack.

Answer 1

Well, you go to the site *computer store* and specify your criteria in the filtering parameters. From the remaining models, you choose the one that looks more "hackish".
2015 is in the yard. Within the same price segment, everything differs only in the color of the sticker on the box.