what is 2/0

$\frac{2}{0}$ is undefined. In fact, any divisor of 0 results in an undefined answer.

A simple division problem (like $\frac{a}{b}$) can be respresented like this $bx=a$ when you solve for x. Let's try one that no one has a problem with first.

$\frac{3}{4}$

As aforementioned, it is the answer for x in $4x=3$.

Now, let's try the same thing with $\frac{2}{0}$.

$0x=2$

No value for x will give you a solution!