tim x biết -2/3 nhân (x-1/4)=1/3 nhân(2x-1)

0 bình luận về “tim x biết -2/3 nhân (x-1/4)=1/3 nhân(2x-1)”

1. $\dfrac{-2}3\left(x-\dfrac14\right)=\dfrac{1}3(2x-1)$

   $\Leftrightarrow \dfrac{-2x}3-\dfrac{-1}{6}=\dfrac{2x}3-\dfrac{1}3$

   $\Leftrightarrow \dfrac{-4x}6-\dfrac{-1}{6}=\dfrac{4x}6-\dfrac{2}6$

   $\Leftrightarrow -4x+1=4x-2$

   $\Leftrightarrow -4x-4x=-2-1$

   $\Leftrightarrow -8x=-3$

   $\Leftrightarrow 8x=3$

   $\Leftrightarrow x=\dfrac38$

   Bình luận

2. `(-2)/3 .(x – 1/4)=1/3 .(2x-1)`

   `(-2)/3 .x – (-1)/6=1/3 x – 1/3`

   `(-2)/3 .x – 1/3 .x= 1/6 – 1/3`

   `x.( (-2)/3 – 1/3)=1/6 – 2/6`

   `x . (-3)/3 = (-1)/6`

   `x .(-1)=(-1)/6`

   `-1x=(-1)/6`

   `-x=(-1)/6`

   `<=>x=1/6`

    

   Bình luận