`x^3-25%x=0`
`<=>x(x^2-25%)=0`
`<=>x(x^2-0,25)=0`
`<=>x(x-0,5)(x+0,5)=0`
`<=>` $\left[ \begin{array}{l}x=0\\x=0,5\\x=-0,5\end{array} \right.$
Vậy `S={0;0,5;-0,5}`
giúp mik nhoa mik đag cần gấp mong mọi ng giúp mik nhoa
x3-25%x=0
x3-0=25%x
x3=25%x
x3:x=25%
x2=\(\dfrac{1}{4}\)
⇒x2=\(\left(\dfrac{1}{2}\right)^2\) hoặc x2=\(\left(\dfrac{-1}{2}\right)^2\)
⇒x=\(\dfrac{1}{2}\) hoặc x=\(\dfrac{-1}{2}\)