Question

Bài 1 : Tìm x

a) 2/3 - 1/3 (x-3/2)-1/2(2x+1)=5

b) (x+1/2)(X-3/4)=0

c) 1/3 x + 3/5 (x+1)=0

d)x-8/2 > 0

e) x:(2/9 - 1/5 )=1/2

g) 1/3 + 1/2 : x = 1/5

Answer 1

a: =>2/3-1/3x+1/2-x-1/2=5

=>-4/3x+2/3=5

=>-4/3x=13/3

=>x=-13/4

b: \(\Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{2}=0\\x-\dfrac{3}{4}=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{2}\\x=\dfrac{3}{4}\end{matrix}\right.\)

c: =>1/3x+3/5x+3/5=0

=>14/15x=-3/5

=>x=-3/5:14/15=-3/5x15/14=-45/70=-9/14

d: =>x>8/2

e: =>x:1/45=1/2

=>x=1/90

g: =>1/2:x=-2/15

=>x=-1/2:2/15=-15/4