tex]...

October 2021 1 14 Report

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1) [tex] \sqrt{28}( \sqrt{14} - \sqrt{7}) - 2 \sqrt{98} [/tex]
2)[tex] \sqrt{12} ( \sqrt{21} + \sqrt{3}) - 3 \sqrt{28} [/tex]

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NNNLLL54

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$1)\quad \sqrt{28}(\sqrt{14}-\sqrt7)-2\sqrt{98}=\sqrt{392}-\sqrt{196}-2\sqrt{98}=\\\\=\sqrt{4\cdot 98}-14-2\sqrt{98}=2\sqrt{98}-14-2\sqrt{98}=-14\\\\2)\quad \sqrt{12}(\sqrt{21}+\sqrt3)-3\sqrt{28}=\sqrt{12\cdot 21}+\sqrt{12\cdot 3}-3\sqrt{28}=\\\\=\sqrt{3\cdot 4\cdot 3\cdot 7}+\sqrt{36}-3\sqrt{28}=3\sqrt{28}+6-3\sqrt{28}=6$

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87232621571 спасибо большое

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