Question

Tìm x thuộc Q 

a, 2007.x(x.2006/7)=0

b, 5.(x-2)+3x(2-x)=0

 

Answer 1

a) \(\orbr{x=0}\)

Answer 2

btvn mà lên mạng thế

Answer 3

a)\(2007x\left(x-\frac{2006}{7}\right)=0\)

\(\Rightarrow x\left(x-\frac{2006}{7}\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x=0\\x-\frac{2006}{7}=0\end{cases}}\)

\(\Rightarrow x=\orbr{\begin{cases}0\\\frac{2006}{7}\end{cases}}\)

b) \(5.\left(x-2\right)+3x\left(2-x\right)=0\)

\(=5\left(x-2\right)-3x\left(x-2\right)=0\)

\(=\left(x-2\right)\left(5-3x\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-2=0\\5-3x=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=2\\3x=5\end{cases}}\Rightarrow\orbr{\begin{cases}x=2\\x=\frac{5}{3}\end{cases}}\)