Question

giúp mình với

Answer 1

d: \(=\left(a+\sqrt{a}+1+\sqrt{a}\right)\left(a-\sqrt{a}+1-\sqrt{a}\right)\)

\(=\left(\sqrt{a}+1\right)^2\cdot\left(\sqrt{a}-1\right)^2=\left(a-1\right)^2\)

Answer 2

`d, -> (a + sqrt a + 1 + sqrt a)(a - sqrt a + 1 - sqrt a)`

`-> (sqrt a +1 )^2(sqrt a - 1)^2`

`= (a-1)^2`