I've seen that people solve this problem by ONLY changing the second number (The number being subtracted) into twos complement, and then they solve, leaving the first number as it is. Is this true? Can you please solve so I can see? Thanks.

11. Find the following differences using twos complement arithmetic. Also indicate if the operation results in a carry bit, and/or if it is a case of overflow. a. 111000 b. 11001100 c. 111100001111 d. 11000011 - 11101000 110011 101110 110011110011