Question

Bài 1:

a, 3. (X.1/2)-3.(x-1/3)=x

b, 1/2. (x+2)-4 (x-1/4)=1/2.x

Bài2:

1,-5/9+14/18-4/9+2/9+1/2007

Giúp mik với ạ

Answer 1

\(Bài1\\ a,\dfrac{3}{2}x-3x+1-x=0\\ -\dfrac{5}{2}x+1=0\\ -\dfrac{5}{2}x=-1\\ \dfrac{5}{2}x=1\\ x=1:\dfrac{5}{2}\\ x=\dfrac{2}{5}\\ b,\dfrac{1}{2}x+1-4x+1-\dfrac{1}{2}x=0\\ -4x+2=0\\ -4x=-2\\ x=\dfrac{2}{4}\\ x=\dfrac{1}{2}\\ Bài2\\ 1,=\left(-\dfrac{5}{9}-\dfrac{4}{9}\right)+\left(\dfrac{14}{18}+\dfrac{2}{9}\right)+\dfrac{1}{2007}\\ =\dfrac{-9}{9}+\left(\dfrac{7}{9}+\dfrac{2}{9}\right)+\dfrac{1}{2007}\\ =-1+1+\dfrac{1}{2007}\\ =0+\dfrac{1}{2007}\\ =\dfrac{1}{2007}\)