Question

Упростите: a-b/a+b - a+b/a-b

Answer 1

=((a-b)^2 - (a+b)^2 )/ (a-b)(a+b) = (a-b-a-b)(a-b+a+b) / (a-b)(a+b) = -2b*2a/(a-b)(a+b) = -4ab/(a-b)(a+b)
вроде так.