邊一句先arm grammer?

(2)How we can solve this problem=how=adv=in what way or manner;eg. How c.y.Leung can solve it politically is a controversial issue."how we can solve this problem"is an adverb clause of manner into what way or manner.
It is correct.Or "arm".

(1)How can we solve this problem...=used to ask whether something is difficult or not. How are you?
It is a question.

How we can solve this problem is a controversial issue.
is correct