Question

plz do f a s t questions​

Answer 1

Step-by-step explanation:

1/a/1/a+1/b=b/a+b

1/a/1/a-1/b=b/b-a

b/b+a+b/b-a=b(b-a+b+a/b^2-a^2)

=b(2b/b^2-a^2)

=2b^2/b^2-a^2