This problem is too hard for me to solve.

这个问题太难，我解决不了。

《新英汉大辞典》

I do not believe this problem is too hard for her.

我不认为这道题对她来太难。

youdao

This problem is not too hard to solve.

这个问题并不难解决。

youdao

This problem is not too hard to solve.

这个问题并不难解决。

youdao