Bài 1
a) 7x - 3x = 3,2
7 - 3x = 3,2
4x = 3,2 : 4
4x = 0,8
Vậy x = 0,8
b) \(\dfrac{2}{3}x-\dfrac{1}{2}x=\dfrac{5}{12}\)
\(\dfrac{2}{3}-\dfrac{1}{2}x=\dfrac{5}{12}\)
\(\dfrac{1}{6}x=\dfrac{5}{12}\)
\(x=\dfrac{5}{12}:\dfrac{1}{6}\)
\(x=\dfrac{5}{2}\)
Vậy x = \(\dfrac{5}{12}\)
a/ \(7x-3x=3,2\)
\(\Rightarrow4x=3,2\Rightarrow x=\dfrac{3,2}{4}=0,8\)
Vậy..........
b/ \(\dfrac{2}{3}x-\dfrac{1}{2}x=\dfrac{5}{12}\)
\(\Rightarrow\left(\dfrac{2}{3}-\dfrac{1}{2}\right)x=\dfrac{5}{12}\)
\(\Rightarrow\dfrac{1}{6}x=\dfrac{5}{12}\Rightarrow x=\dfrac{5}{12}:\dfrac{1}{6}=\dfrac{5}{2}\)
Vậy......
