计算(√a³-√a²b／a-√ab)-(a-b／√a+√b)

计算(√a³-√a²b／a-√ab)-(a-b／√a+√b)
=(a√a-a√b)/√a(√a-√b)-(a-b)/(√a+√b)
=a/√a-(√a-√b)
=√a-√a+√b
=√b;
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