定语从句,it's so difficult a problem _no one can work outit's so

This is so difficult a problem as no one can work out.as能不能换 1.The math problem is so difficult that I can't work it out. the problem is so difficult（ ） we can't work it out The problem is so difficult that nobody can work it out(改为同义 英语改句子The math problem is so difficult that we can't work it 同义句 The math problem is so difficult that nobody can work it The math problem is so difficult that［］students can work it The problem is so difficult that I can't work it out.同义句 This problem is so difficult that nobody can work it out. This problem is so difficult that we can't work it out.(保持句意 This problem is so difficult that nobody can work it out.(保持 9. It is such a difficult problem _______ no one can work ou