Those don’t, to my eye, look too badly worn.
As mentioned above, the teeth have different profiles, as a matter of aiding shifting from one ring to another. They’re supposed to look like that, as it turns out.
I’ve also a strong suspicion that replacing those three chainrings will run you (easily) more than what you paid for the bike. I have one chainring (mildly specialist, but deeply on sale) en route that’s running me ~$40. As a data point.
Assuming the chain isn’t snagging at the bottom of the pedal stroke or slipping under load, I’d leave it as-is. Given the (apparent) gearing, it seems odd that you’d be looking for more low-end going up hills- and, there seems to be some pretty uneven brake pad wear on the rear rim (non-drive side). That’d indicate a badly out-of-true rear wheel that’s rubbing a brake pad. It seems more likely that’s what’s causing you to expend so much effort (rather than the gearing).
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