`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`
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