

E cần gấp ạ!câu 7và 9
7) [imath]\sqrt{x^2 -4x +4} = x-2[/imath]
9) [imath]\sqrt{x^2 - 2\sqrt{5}x + 5} = x - \sqrt{5}[/imath]
7) [imath]\sqrt{x^2 -4x +4} = x-2[/imath]
9) [imath]\sqrt{x^2 - 2\sqrt{5}x + 5} = x - \sqrt{5}[/imath]
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