Question

[Nguyễn Thùy Linh]

128 bằng mấy mũ hai vậy

Answer 1

[tnhy]

\(\left(8\sqrt{2}\right)^2\)

Answer 2

[Nguyễn Thái Thịnh]

Gỉa sử:  \(x^2=128\)

\(\Rightarrow\orbr{\begin{cases}x=\sqrt{128}\\x=-\sqrt{128}\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=8\sqrt{2}\\x=-8\sqrt{2}\end{cases}}\)

\(\Rightarrow128=\left(\pm8\sqrt{2}\right)^2\)