Question

2.tìm x

a,\(\dfrac{2}{3}\times x-\dfrac{1}{2}\times x=\dfrac{5}{12}\)

b,(\(2\dfrac{4}{5}\times x-50\)):\(\dfrac{2}{3}\times x=51\)

Answer 1

a) \(\dfrac{2}{3}.x-\dfrac{1}{2}.x=\dfrac{5}{12}\)

=> \(\left(\dfrac{2}{3}-\dfrac{1}{2}\right).x=\dfrac{5}{12}\)

=> \(\left(\dfrac{4}{6}-\dfrac{3}{6}\right).x=\dfrac{5}{12}\)

=> \(\dfrac{1}{6}\) . x = \(\dfrac{5}{12}\)

=> \(x=\dfrac{5}{12}:\dfrac{1}{6}\)

=> x =\(\dfrac{5}{12}.\dfrac{6}{1}\)

=> x = \(\dfrac{5}{2}\)

Vậy x = \(\dfrac{5}{2}\)

Answer 2

Lời giải:

a, \(\dfrac{2}{3}x-\dfrac{1}{2}x=\dfrac{5}{12}\)

\(\Rightarrow\left(\dfrac{2}{3}-\dfrac{1}{2}\right)x=\dfrac{5}{12}\)

\(\Rightarrow\dfrac{1}{6}x=\dfrac{5}{12}\)

\(\Rightarrow x=\dfrac{5}{12}.6\)

\(\Rightarrow x=\dfrac{5}{2}\)