The first one seems fine.
The second one, however, is not correct. Firstly, notice that (A+B)+B does not depend on C, so draw it out without C to avoid further confusion.
The area of A+B (with "+" being XOR) in the diagram below is regions 1 and 3
Now XOR is just like "their union minus their intersection." So the result is just the set A (regions 1 and 2)
In fact, XOR is associative.... (A+B)+C = A+(B+C)
and also B+B = empty set, and so
(A+B) + B = A+(B+B) = A + empty set = A.