/ a-根号ab +除以2根号ab/根号a+根号b=(√b-√a+1)/√a(√a-√b)+[1/(√b-√a)-1/(√a+√b)]*(√a+√b)/2√ab=(√b-√a+1)/√a(√a-√b)+2√a/(√b-√a)(√a+√b)*(√a+√b)/2√ab=(√b-√a+1)/√a(√a-√b)+1/√b(...