High number limit operation Limf (x) = + 00 limg (x) = + 00 limh (x) = a LIM (f (x) + G (x)) = + 00 and lim (f (x) + H (x)) = + 00 LIM (f (x) g (x)) = + 00 are correct? Not according to the limit algorithm, what can we do when infinity or limit does not exist?

High number limit operation Limf (x) = + 00 limg (x) = + 00 limh (x) = a LIM (f (x) + G (x)) = + 00 and lim (f (x) + H (x)) = + 00 LIM (f (x) g (x)) = + 00 are correct? Not according to the limit algorithm, what can we do when infinity or limit does not exist?

In the question, "according to the limit algorithm, you can't do this when infinity or limit doesn't exist."
In questioning, he said that "the operation criterion of limit is that limit exists, they are equal to + ∞ and can't work"
LIM (f (x) + G (x)) = + ∞ and lim (f (x) + H (x)) = + ∞ and lim (f (x) g (x)) = + ∞ are true,
They are correct according to the definition of limit rather than the limit algorithm