3-1 21/17

To solve 3-1 + 21/17, we first need to add 3 and -1 which equals 2. Then we add this result to 21/17:

2 + 21/17 = 2 + 21/17 = (2*17 + 21) / 17 = (34 + 21) / 17 = 55 / 17

Therefore, 3-1 + 21/17 simplifies to 55/17.