How to do the first question of mathematics integral for postgraduate entrance examination?
Hello, in this question, you can set ts in F as U, then du=tdx takes U, DX = 1/t du into the original formula, and T can be omitted. The original formula =∫0-s f(u)du has nothing to do with T, but is only related to S, which is purely played by mobile phones. If your problem is solved, I hope to adopt it.