(a+2根号ab+b)/(a-b) 减去 {[根号a/（a+根号ab）减去 根号b/（b-根号ab）]}除以根号a/（b+根号ab）=(√a+√b)^2/(a-b)- {[√a/（a+√ab）- √b/（b-√ab）]}/√a/（b+√ab）=(√a+√b)^2/(a-b)- {[√a（b-√ab）-（a...