Bài `1` : Tìm `x` `x/3` = `8/12` `x + 1/15` = `1/3` `-2/7` + `4/7` `x` = `5/7` `3/4` : `x` - `5/4` = `-1/21
2 câu trả lời
`1)`
`x/3` `=` `8/12`
`=>` `12x` `=` `8.3`
`=>` `x` `=` `(8.3)/12`
`=>` `x` `=` `2`
Vậy `x` `=` `2`
`2)`
`x + 1/15 = 1/3`
`x = 1/3 - 1/15`
`x = 5/15 - 1/15`
`x = 4/15`
Vậy `x` `=` `4/15`
`3)` `(-2)/7 + 4/7x = 5/7`
`4/7x = 5/7 - ( -2)/7`
`4/7x = 1`
`x = 1 : 4/7`
`x = 1 . 7/4`
` x = 7/4`
Vậy `x` `=` `7/4`
`4)`
`3/4 : x - 5/4 = (-1)/21`
`3/4 : x = (-1)/21 + 5/4`
`3/4 : x = (-4)/84 + 105/84`
`3/4 : x = 101/84`
`x` `=` `3/4` `:` `101/84`
`x` `=` `3/4` `.` `84/101`
`x` `=` `63/101`
Vậy `x` `=` `63/101`
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