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Найдите значение выражения
4
3
⋅
5
13
⋅
39
4\sqrt{3}\cdot 5\sqrt{13}\cdot \sqrt{39}
4
3
⋅
5
13
⋅
39
Ответ:
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Решение
4
3
⋅
5
13
⋅
39
=
4
⋅
3
⋅
5
⋅
13
⋅
3
⋅
13
=
4
⋅
5
⋅
3
⋅
13
⋅
3
⋅
13
=
20
⋅
(
3
⋅
3
)
⋅
(
13
⋅
13
)
=
20
⋅
3
⋅
13
=
780
\begin{aligned}
{}& 4\sqrt{3}\cdot 5\sqrt{13}\cdot \sqrt{39} = 4\cdot \sqrt{3}\cdot 5\cdot \sqrt{13}\cdot \sqrt{3\cdot 13} = \\
& 4\cdot 5\cdot \sqrt{3}\cdot \sqrt{13}\cdot \sqrt{3}\cdot \sqrt{13} = \\
& 20\cdot (\sqrt{3}\cdot\sqrt{3})\cdot (\sqrt{13}\cdot\sqrt{13}) = \\
& 20\cdot 3\cdot 13 = 780
\end{aligned}
4
3
⋅
5
13
⋅
39
=
4
⋅
3
⋅
5
⋅
13
⋅
3
⋅
13
=
4
⋅
5
⋅
3
⋅
13
⋅
3
⋅
13
=
20
⋅
(
3
⋅
3
)
⋅
(
13
⋅
13
)
=
20
⋅
3
⋅
13
=
780
Ответ:
780
780
780
.
