Question

tim x biet x^100=x

Answer 1

x¹⁰⁰ = x

=> x¹⁰⁰ - x = 0

=> x⁹⁹.x - x = 0

=> x(x⁹⁹ - 1) = 0

\(\Rightarrow\orbr{\begin{cases}x=0\\x^{99}-1=0\end{cases}\Rightarrow\orbr{\begin{cases}x=0\\x^{99}=1\end{cases}\Rightarrow}\orbr{\begin{cases}x=0\\x=1;-1\end{cases}}}\)

Answer 2

1 hoặc 0

Answer 3

ST sai r neu x=-1 thi k thoa man x^100=x