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20 12 what is the fourth question of Anhui mathematics college entrance examination?
C is the correct answer.

The negation of the true proposition is "only without conclusion", and the negation of the proposition is "unconditionally without conclusion"

But at the same time, we should also understand that "for any form (or existence) ... and for ..." is particularly difficult to think about, because it is not the same as intuitive understanding. Intuitively, it seems that the conclusion should be that the first half of the sentence is fixed and the second half only changes, but this is different. Although I want to explain it to you in detail, I'm a little confused. ...

Which one do you want to choose?