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2?7 + 3?7 =
- 5?7
5?11 - 2?11 =
- 3?11
8?3 - 10?3 =
- -2?3
??5 + 2??5 =
- 3??5
4³?5 - 6³?5 =
- -2³?5
?7 + ?7 =
- 2?7
?27 + ?3 =
- 4?3
3?5 + ?20 =
- 5?5
?25 - ?4 + ?16=
- 7