1) x : 5 + 19 = 14
2) -2/3 x + 4/7 = 3/4
3) | 1/2x – 1/3 | = 5/7
4) 5 : x – 19 = 14
5) 3 1/2 – 1/2x = 5/4
6) | 1/2x + 1/3 | = 7/4
1) x : 5 + 19 = 14
2) -2/3 x + 4/7 = 3/4
3) | 1/2x – 1/3 | = 5/7
4) 5 : x – 19 = 14
5) 3 1/2 – 1/2x = 5/4
6) | 1/2x + 1/3 | = 7/4
1) x : 5 + 19 = 14
⇒ x : 5 = -5
⇒ x = -5 × 5 = -25
2) `-2/3 x` + `4/7` = `3/4`
⇒ `-2/3 x ` = `3/4` – `4/7`
⇒`-2/3 x ` = `5/28`
⇒ x = `5/28` : `-2/3` = `-15/56`
3) `| 1/2 x – 1/3 |` = `5/7`
⇒ `1/2 x` – `1/3` = `5/7`
`1/2 x` – `1/3` = `-5/7`
⇒ `1/2 x` = `22/21`
`1/2 x` = `-8/21`
⇒ x = `44/21`
x = `-16/21`
4) 5 : x – 19 = 14
⇒ 5 : x = 33
⇒ x = `33/5`
5)`3 1/2` – `1/2 x` = `5/4`
⇒ `1/2 x` = `3 1/2` – `5/4`
⇒ `1/2 x` = `9/4`
⇒ x = `9/2`
6) `| 1/2 x + 1/3 |` = `7/4`
⇒ `1/2 x` + `1/3` = `7/4`
`1/2 x` + `1/3` = `-7/4`
⇒ `1/2 x` = `17/12`
`1/2 x` = `-25/12`
⇒ x = `17/6`
x = `-25/6`
@MB3R
Tham khảo nha