`2/5` `.` `(1` `-` `1/2` `x)` `-` `2x` `=` `1/5`

2 câu trả lời

Đáp án:

`\frac{2}{5} . (1 - \frac{1}{2}x) - 2x = \frac{1}{5}`

`⇔ \frac{2}{5} - \frac{1}{5}x - 2x = \frac{1}{5}`

`⇔ \frac{2}{5} - 2\frac{1}{5}x = \frac{1}{5}`

`⇔ 2\frac{1}{5}x = \frac{2}{5} - \frac{1}{5}`

`⇔ 2\frac{1}{5}x = \frac{1}{5}`

`⇔ x = \frac{1}{11}`

Vậy `x = \frac{1}{11}`.

Chúc học tốt!!!

 

 

`2/5 .(1-1/2 x)-2x=1/5`

`⇔ 2/5 - 2/5 . 1/2x-2x=1/5`

`⇔ 2/5 - 1/5x-2x=1/5`

`⇔ (-1)/5x-2x=1/5-2/5`

`⇔ (-1)/5x-2x=(-1)/5`

`⇔ x.((-1)/5-2)=(-1)/5`

`⇔ x. (-11)/5=(-1)/5`

`⇔ x= (-1)/5:(-11)/5`

`⇔ x=(-1)/5.(-5)/11`

`⇔ x=1/11`

Vậy `x=1/11`