It looks like you've provided a few math problems. Let's solve them one by one:

1. **2,234 x 7772,234 x 777**: It seems like there might be a formatting issue here. If you meant to multiply 2,234 by 7,772,234 by 777, that's a straightforward multiplication. However, if you meant to multiply 2,234 by 7,772 and then by 234 and by 777, please clarify.

Assuming you want to multiply 2,234 by 7,772:
\[
2,234 \times 7,772 = 17,307,928
\]

(This does not include the check with 234 and 777, please clarify if needed.)

2. **3.4 x 5**:
\[
3.4 \times 5 = 17
\]

3. **45 : 3** (which is the same as 45 ÷ 3):
\[
45 \div 3 = 15
\]

If you could clarify any part of the first expression or if you have any other problems, let me know!