\(\left(x-2,5\right)^2=9\\ \Rightarrow\left(x-2,5\right)^2=3^2\\ \Rightarrow x-2,5=\pm3\\ \Rightarrow\left[{}\begin{matrix}x-2,5=3\\x-2,5=-3\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=5,5\\x=-0,5\end{matrix}\right.\)
\(\left(1-x\right)^3=-8\\ \Rightarrow\left(1-x\right)^3=-2^3\\ \Rightarrow1-x=-2\\ \Rightarrow x=1-\left(-2\right)\\ \Rightarrow x=3\)
\(2^{4-x}=16\\ \Rightarrow2^{4-x}=2^4\\ \Rightarrow4-x=4\\ \Rightarrow x=4-4\\ \Rightarrow x=0\)
a: =>x-2,5=3 hoặc x-2,5=-3
=>x=5,5(loại) hoặc x=-0,5(loại)
b: =>1-x=-2
=>x=3(nhận)
c: =>4-x=4
=>x=0(nhận)
\(\left(x-2,5\right)^2=9\)
\(\Rightarrow\left(x-2,5\right)^2=3^2\)
\(\Rightarrow\left[{}\begin{matrix}x-2,5=-3\\x-2,5=3\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=-0,5\text{ }\\x=5,5\end{matrix}\right.\)
b) \(\left(1-x\right)^3=-8\)
\(\Rightarrow\left(1-x\right)^3=\left(-2\right)^3\)
\(\Rightarrow1-x=-2\)
\(\Rightarrow x=1+2\)
\(\Rightarrow x=3\)
c) \(2^{4-x}=16\)
\(\Rightarrow2^{4-x}=2^4\)
\(\Rightarrow4-x=4\)
\(\Rightarrow x=4-4\)
\(\Rightarrow x=0\)
a)(x-2,5)^2=9
(x-2,5)^2=3^2
x-2,5=3
x=3+2,5
x=5,5
b)(1-x)^3=-8
(1-x)^3=(-2)^3
1-x=-2
x=1-(-2)
x=3
c) 2^4-x=16
2^4-x=2^4
4-x=4
x=0
