In solving the following problems, Xiao Ming gives two solutions: the square of a - the square of B / A + B Solution 1: original formula = (a + b) (a-b) / A + B = a-b Solution 2: the original formula = (the square of a-b) (a-b) / (a + b) (a-b) = (the square of a-b) (a-b) / the square of A-B = a-b

In solving the following problems, Xiao Ming gives two solutions: the square of a - the square of B / A + B Solution 1: original formula = (a + b) (a-b) / A + B = a-b Solution 2: the original formula = (the square of a-b) (a-b) / (a + b) (a-b) = (the square of a-b) (a-b) / the square of A-B = a-b

The second is wrong, because I don't know if (a-b) is equal to 0

I would like to ask you a question about absolute value simplification, because I haven't made clear the format of this type of questions
The solution and format of this kind of problem
All right, I'll score~
Example: | - 2b | - simplification
B is greater than or equal to 0