\(x^2-25\%=0\)
\(\Rightarrow x^2-\frac{1}{4}=0\)
\(\Rightarrow x^2=0+\frac{1}{4}\)
\(\Rightarrow x^2=\frac{1}{4}\)
Tự làm tiếp !!! ^.^"
\(x^2-25\%x=0\)
\(\Rightarrow x^2-\frac{25}{100}x=0\)
\(\Rightarrow x^2-\frac{1}{4}x=0\)
Tìm nốt :v
x . 2 - 25% . x = 0
x . 2 - 1/4 . x = 0
x . ( 2 - 1/4 ) = 0
x . 7/4 = 0
x = 0 : 7/4
x = 0.
\(2x=x^2\)
x + x = x . x
x + x - x . x = 0
( x - x . x ) + x = 0
x . ( x - 1 ) + ( x - 1 ) = 0 - 1
( x + 1 ) . ( x - 1 ) = -1
x + 1 = -1 / x - 1
\(\Rightarrow x-1\inƯC\left(-1\right)=\left\{\pm1\right\}\)
\(\Rightarrow\hept{\begin{cases}x-1=-1\\x-1=1\end{cases}\Rightarrow\hept{\begin{cases}x=0\\x=2\end{cases}}}\)
\(\Rightarrow\hept{\begin{cases}x=0\\x=2\end{cases}}\)
