If AB are all non-zero rational numbers, then a △ | a | + B △ B | =
When a > 0, b > 0, the original formula is 2
When a
a. B are all non-zero rational numbers, then AB / | ab | =?
1 or - 1
If a and B are non-zero rational numbers, and a / | a | plus B / | B | = 0, find the value of AB / | ab |,
The different signs of a and B are known from the previous conditions
Then AB / | ab | = - 1