Brackets can change the outcome of a computation, but there were no stinking brackets. Did you see any brackets? I didn't see any brackets, and therefore you go by the order of operations, like I said before. There is no, "It depends where you put the brackets".
On the 2nd one, I think you're wrong and I think the whole internet is wrong. You are taking 1, like 1 pie, and you are dividing it into infinite pieces. You cut it in half, and then quarters, and eventually millionths and trillionths, but you never stop cutting it. And you can't cut zero. Fortunately, you never get to zero, though you get closer every time you cut. There has to be something there to cut, if you're cutting, and there is something, because when you cut something up an infinite number of times, you never stop cutting.