Question

a, 1/2.x-2/3.x=7/12

b, (3x-6)(1/3.x+1)=0

Answer 1

Lại phải nhờ mọi người rồi 

Answer 2

a) \(\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)

\(\frac{-1}{6}x=\frac{7}{12}\)

\(x=\frac{-7}{2}\)

Vậy \(x=\frac{-7}{2}\)

b) Ta có: \(\left(3x-6\right).\left(\frac{1}{3}x+1\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}3x-6=0\\\frac{1}{3}x+1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2\\x=-3\end{cases}}}\)

Vậy \(x\in\left\{2;-3\right\}\)

Answer 3

a)x(1/2-2/3)=7/12

=>x.(-1/6)=7/12

=>x=7/12:(-1/6)

=>x=-7/2