The problem is worth considering.
The problem is worthy to be considered.
The problem is worthy of being considered.
worthy的两种搭配：be worthy to be done,be worthy of being done.
worth只有一种搭配：be worth doing（这个doing是主动形式,但它表示的是被动意义.）
如：
这本书值得读两遍.
The book is worth reading twice.
=The book is worthy to be read twice.
=The book is worthy of being read twice.