Question

\(\left(2,7-x\right)^{10}=1\)

Answer 1

=>2,7-x=1 hoặc 2,7-x=-1

=>x=1,7 hoặc x=3,7

Answer 2

`(2,7-x)^10 =1 `

`<=> `\(\left[{}\begin{matrix}2,7-x=1\\2,7-x=-1\end{matrix}\right.\)

`<=>`\(\left[{}\begin{matrix}x=2,7-1=1,7\\x=2,7-\left(-1\right)=2,7+1=3,7\end{matrix}\right.\)

Vậy \(\left[{}\begin{matrix}x=1,7\\x=3,7\end{matrix}\right.\)

Answer 3

`=> 2,7 - x = +-1`

`=> x = -3,7` hoặc `x = 1,7`.

Answer 4

\(\left(2,7-x\right)^{10}=1\\ \Leftrightarrow\left(2,7-x\right)^{10}=\left(\pm1\right)^{10}\\ \Leftrightarrow\left[{}\begin{matrix}2,7-x=1\\2,7-x=-1\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=1,7\\x=3,7\end{matrix}\right.\)

Answer 5

\(\left(2,7-x\right)^{10}=1\)

`=>`\(\left[{}\begin{matrix}2,7-x=1\\2,7-x=-1\end{matrix}\right.\)

`=>`\(\left[{}\begin{matrix}x=1,7\\x=3,7\end{matrix}\right.\)