Bài 2:
1) \(\sqrt{x}-2+x\sqrt{x}-2x=\left(\sqrt{x}-2\right)\left(1+x\right)\)
2) \(x-10\sqrt{x}+25=\left(\sqrt{x}-5\right)^2\)
3) \(4x+4\sqrt{x}+1=\left(2\sqrt{x}+1\right)^2\)
4) \(9x-6\sqrt{x}+1=\left(3\sqrt{x}-1\right)^2\)
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