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Răspuns :

Hiii34

Răspuns:

[tex]6 \sqrt{7} - 9 \sqrt{3} - 6 \sqrt{7 } = \\ = - 9 \sqrt{3} [/tex]

 

[tex]\displaystyle\bf\\3\cdot \Big(2\sqrt{7}-3\sqrt{3}\Big)-\sqrt{252}=\\\\=6\sqrt{7}-9\sqrt{3}-\sqrt{36\times7}=\\\\=\underline{6\sqrt{7}}-9\sqrt{3}-\underline{6\sqrt{7}}=\boxed{\bf-9\sqrt{3}}[/tex]