Ответ:
[tex]\sqrt{36a} -\sqrt{49a}+\sqrt{9a} =\sqrt{36}*\sqrt{a} -\sqrt{49}*\sqrt{a} +\sqrt{9}*\sqrt{a} =6\sqrt{a}-7\sqrt{a} +3\sqrt{a} = 9\sqrt{a} -7\sqrt{a} =2\sqrt{a}[/tex]
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Ответ:
[tex]\sqrt{36a} -\sqrt{49a}+\sqrt{9a} =\sqrt{36}*\sqrt{a} -\sqrt{49}*\sqrt{a} +\sqrt{9}*\sqrt{a} =6\sqrt{a}-7\sqrt{a} +3\sqrt{a} = 9\sqrt{a} -7\sqrt{a} =2\sqrt{a}[/tex]