[√ab - ab/(a+√ab)]÷( (√ab-a) / (a-b) )= [√ab - ab/(√a(√a+√b))]÷( (√a(√b-√a)) / ((√a-√b)(√a+√b)) )= [√ab - √a*b/(√a+√b)]÷( -√a / (√a+√b) )= -[√ab - √a*b/(√a+√b)] /√a * (√a...