Question

Cho \(A=\dfrac{\sqrt{x-1-2\sqrt{x-2}}}{\sqrt{x-1}-1}\)

a/Tim DKXD cua A

b/Rut gon A

Answer 1

sữa đề chút

a) đkxđ : \(x>2;x\ne3\)

b) ta có : \(A=\dfrac{\sqrt{x-1-2\sqrt{x-2}}}{\sqrt{x-2}-1}=\dfrac{\sqrt{\left(\sqrt{x-2}-1\right)^2}}{\sqrt{x-2}-1}=1\)

Answer 2

Mysterious Persondz Hung nguyendz Nguyễn Huy Thắngdz

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