Question

 

Tìm x

5x ( x -1 ) = x - 1 

Answer 1

x=1 la nghiem

x khac 1 chia hai ve cho x-1

5x=1=> x=1/5

KL: 

x=1 

x=1/5

Answer 2

5x ( x -1 ) = x - 1 

5x²-5x=x-1

5x²-5x-x+1=0

5x²-6x+1=0

5x²-5x-x+1=0

5x(x-1)-(x-1)=0

(x-1)(5x-1)=0

           \(\Rightarrow\orbr{\begin{cases}x-1=0\\5x-1=0\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=1\\x=\frac{1}{5}\end{cases}}\)

Answer 3

Mk chịu