Question

\(\sqrt{4\left(x-1\right)}-\sqrt{9\left(x-1\right)}-\sqrt{16\left(x-1\right)}\)

Answer 1

ĐK: x \(\ge\) 1

Có:

\(=\sqrt{4}.\sqrt{x-1}-\sqrt{9}.\sqrt{x-1}-\sqrt{16}.\sqrt{x-1}\\ =2.\sqrt{x-1}-3.\sqrt{x-1}-4.\sqrt{x-1}\\ =\sqrt{x-1}\left(2-3-4\right)\\ =-5\sqrt{x-1}\)

Answer 2

\(=2\sqrt{x-1}-3\sqrt{x-1}-4\sqrt{x-1}\)

\(=-5\sqrt{x-1}\)