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[tex](2 \sqrt{7}+3 \sqrt{6} )(5 \sqrt{2}+4 \sqrt{3} )=10 \sqrt{14}+8 \sqrt{21} +15 \sqrt{12}+12 \sqrt{18} = \\ =10 \sqrt{14}+8 \sqrt{21} +15 *2\sqrt{3}+12*3 \sqrt{2}= \\ = 10 \sqrt{14}+8 \sqrt{21} +30\sqrt{3}+36 \sqrt{2}[/tex]

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