what is 5 divide by zero? but the answer is not zero???????????????????????????????????????????????????????????????????????????

That's right.  The answer is not zero.  In fact, there's no answer at all, simply because there's no question.  In math in general, division by zero is "not permitted", and if people start talking about it, the answer is called "indeterminate" ... that means vague, and can't be determined.Division is repeated subtraction.  6 divided by 2 means:  "How many times can you take 2 away from 6 before the 6 is all used up and gone ?", and the answer is: 3 times and then it's gone.  So the question is really asking:  "How many times can you take zero away from 5 before the 5 is all used up and gone ?".  There's no answer, becauseno matter how many times you take away zero, you can never use up the 5 . One more comment on the subject:  Save your question marks.  One is plenty.

5 divide by zero is Undefined.