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[√a+(b-√ab/√a+√b)]÷[(a/√ab+b)+(b/√ab-a)-(a+b/√ab)]-√b
=[(a+√ab+b-√ab)/(√a+√b)]÷[a/√b(√a+√b)+b/√a(√b-√a)-(a+b/√ab)]-√b
=[(a+b)/(√a+√b)]÷[a*√a(√b-√a)/√ab(b-a)+b*√b(√b+√a)/√ab(b-a)-(a+b/√ab)]-√b
=[(a+b)/(√a+√b)]÷[(a*√ab-a²+b²+b*√ab)/√ab(b-a)-(a+b/√ab)]-√b
=[(a+b)/(√a+√b)]÷[(a+b)/(b-a)+(a+b)/√ab-(a+b/√ab)]-√b
=[(b-a)/(√a+√b)]-√b
=√b-√a-√b
=-√a
=[(a+√ab+b-√ab)/(√a+√b)]÷[a/√b(√a+√b)+b/√a(√b-√a)-(a+b/√ab)]-√b
=[(a+b)/(√a+√b)]÷[a*√a(√b-√a)/√ab(b-a)+b*√b(√b+√a)/√ab(b-a)-(a+b/√ab)]-√b
=[(a+b)/(√a+√b)]÷[(a*√ab-a²+b²+b*√ab)/√ab(b-a)-(a+b/√ab)]-√b
=[(a+b)/(√a+√b)]÷[(a+b)/(b-a)+(a+b)/√ab-(a+b/√ab)]-√b
=[(b-a)/(√a+√b)]-√b
=√b-√a-√b
=-√a
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