Ответ:
[tex]\sqrt{4x}-\sqrt{25x}+\sqrt{81x}=\sqrt{4}*\sqrt{x} -\sqrt{25} *\sqrt{x} +\sqrt{81} *\sqrt{x} =2\sqrt{x} -5\sqrt{x} +9\sqrt{x} =-3\sqrt{x} +9\sqrt{x} =6\sqrt{x}[/tex]
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Ответ:
[tex]\sqrt{4x}-\sqrt{25x}+\sqrt{81x}=\sqrt{4}*\sqrt{x} -\sqrt{25} *\sqrt{x} +\sqrt{81} *\sqrt{x} =2\sqrt{x} -5\sqrt{x} +9\sqrt{x} =-3\sqrt{x} +9\sqrt{x} =6\sqrt{x}[/tex]