Giúp mình vs tìm x biết 1/2x+2/5×(5x+250 %)=2,25 24/08/2021 Bởi Ximena Giúp mình vs tìm x biết 1/2x+2/5×(5x+250 %)=2,25
Đáp án: `1/2x + 2/5 . (5x + 250%) = 2,25` `⇔ 1/2x + 2/5 . (5x + 5/2) = 9/4` `⇔ 1/2x + 2x + 1 = 9/4` `⇔ (1/2 + 2)x + 1 = 9/4` `⇔5/2x + 1 = 9/4` `⇔ 5/2x = 9/4 – 1` `⇔ 5/2x = 5/4` `⇔x = 5/4 : 5/2` `⇔ x = 1/2` `text{Vậy}` `x = 1/2` Bình luận
Đáp án:
`1/2x + 2/5 . (5x + 250%) = 2,25`
`⇔ 1/2x + 2/5 . (5x + 5/2) = 9/4`
`⇔ 1/2x + 2x + 1 = 9/4`
`⇔ (1/2 + 2)x + 1 = 9/4`
`⇔5/2x + 1 = 9/4`
`⇔ 5/2x = 9/4 – 1`
`⇔ 5/2x = 5/4`
`⇔x = 5/4 : 5/2`
`⇔ x = 1/2`
`text{Vậy}` `x = 1/2`