1）The book is so written that it gives a quite wrong idea of the facts.

2）His diligence was such that he made great progress.

     (=Such was his diligence that he made great progress.)

1)句中so后直接是written,不像通常都带有形容词或副词

——这里，written 是形容词，一般现在时即可说明问题。 so written 可能是 so well written ，也可能是so badly written，需根据语境判断。本句是后者：写得太离谱了/很差劲。

2)句such后也没有名词。

—— such 单独使用，后面没有被限定语，说明是代词。