What's wrong in the paradox?

there are many paradoxes in math that seem so true. they are tricky, but can you find what's wrong in them?

in this problem, you will try to find out what's wrong in these paradoxes.

A)

X≠Y

X(0)=Y(0)

$\frac{X(0)}{0}$ = $\frac{Y(0)}{0}$

X=Y

B)

0=

0+0+0+......=

(1-1)+(1-1)+(1-1)......=

1+(-1+1)+(-1+1)+(-1+1)......=

1+0+0+0....=

1