(根号ab-a+根号ab分之ab)除以(a-b分之根号ab-b)
问题描述:
(根号ab-a+根号ab分之ab)除以(a-b分之根号ab-b)
答
[√ab-ab/(a+√ab)]÷(√ab-b)/(a-b)
=(a√ab+ab-ab)/(a+√ab)×(a-b)/(√ab-b)
=a√ab/√a(√a+√b)×(√a+√b)(√a-√b)/√b(√a-√b)
=a√b/(√a+√b)×(√a+√b)/√b
=a