Question

чему равно а=?$\sqrt{a}+ \sqrt{4}= \sqrt{81}$

Answer 1

$\sqrt{a}+ \sqrt{4}= \sqrt{81} \\ \\ \sqrt{a} = \sqrt{81} - \sqrt{4} \\ \\ \sqrt{a} = 9 - 2 = 7 \\ \\ (\sqrt{a})^2 = 7^2 \\ \\ a = 49$

Ответ: a = 49 

Answer 2

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