4. Выполните действия: (4√27

tamarabernukho

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Ответ:

36-√21

Объяснение:

(4√27 – 3√7) • √3 + √84=4√27•√3 - 3√7•√3 +√(4*21)=

4√81-3√21+2√21=4*√(9²)-√21=4*9-√21=36-√21

4 votes Thanks 3

Mihail001192

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$(4 \sqrt{27} - 3 \sqrt{7} ) \times \sqrt{3} + \sqrt{84} = 4 \sqrt{27} \sqrt{3} - 3 \sqrt{7} \sqrt{3} + \sqrt{84} = \\ \\ = 4 \sqrt{81} - 3 \sqrt{21} + \sqrt{84} = 4 \times 9 - 3 \sqrt{21} + \sqrt{4 \times 21} = \\ \\ = 36 - 3 \sqrt{21} + 2 \sqrt{21} = 36 - \sqrt{21} \\ \\$

2 votes Thanks 1

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