問題, もんだい
1. question (e.g. on a test), problem
2. problem (e.g. societal, political), issue, subject (e.g. of research), case, matter
3. question (i.e. doubt)
4. public discussion, controversy
5. trouble, inconvenience, difficulty
あなたはどのようにしてその問題を解いたのですか。
には
Expression, Particle, See に・1, emphasises word marked by に
1. to, for, on, in, at
2. in order to
See は・1, indicates respect for subject of sentence
3. as for, regarding
as AにはAが...; emphasizes the repeated word, followed by a contrasting statement
4. while it is (was) the case that ..., indeed ... (but), certainly ... (but)
数学は私には難しい。