(a/b - b/a) : (1+ a/b) при a = 9V7 b = 6v7 Srochno plz

Question

(a/b - b/a) : (1+ a/b) при a = 9V7 b = 6v7
Srochno plz

Answer 1

(a/b-b/a)/(1+a/b)=((a²-b²)/ab)/(a+b)/b=((a+b)(a-b)/ab)/(a+b)/b=(a-b)/a=
=(9√7-6√7)/9√7=3√7/9√7=1/3.