1.Tìm ‘x’ biết a,(3x+1):(-4)=-28 b, ‘x-49=5/18 ‘ c,’23x-3/4x’=$1\frac{1}{6}$ 14/08/2021 Bởi Arianna 1.Tìm ‘x’ biết a,(3x+1):(-4)=-28 b, ‘x-49=5/18 ‘ c,’23x-3/4x’=$1\frac{1}{6}$
1) a) (3`x` + 1 ) : (-4) = -28 ( 3`x` + 1 ) = -28 . (-4) 3`x` + 1 = 112 3`x` = 112-1 3`x` = 111 `x` = 111 : 3 `x` = 37 Vậy `x` = 37 b) `x` – 49 = `5/18` `x` = `5/18` + 49 `x` = `5/18`+ `882/18` `x` = `887/18` c) `23` `x` – `3/4` `x` = 1`1/6` x ( 23 – `3/4` ) = `7/6` `x`(`92/4` – `3/4`) = `7/6` `x` . `89/4` = `7/6` `x` = `7/6` : `89/4` `x` = `7/6` . `4/89` `x` = `14/267` Bình luận
`a) ( 3x+1) : ( -4) = -28` `=> 3x +1 = 112` `=> 3x = 111` `=> x = 37` `b) x – 49 = 5/18` `=> x = 49 + 5/18` `=> x = 887/18` `c) 23x – 3/4.x = 1\frac{1}{6}` `=> x( 23 – 3/4 ) = 7/6` `=> x . 89/4 = 7/6` `=> x = 14/267` Bình luận
1)
a) (3`x` + 1 ) : (-4) = -28
( 3`x` + 1 ) = -28 . (-4)
3`x` + 1 = 112
3`x` = 112-1
3`x` = 111
`x` = 111 : 3
`x` = 37
Vậy `x` = 37
b) `x` – 49 = `5/18`
`x` = `5/18` + 49
`x` = `5/18`+ `882/18`
`x` = `887/18`
c) `23` `x` – `3/4` `x` = 1`1/6`
x ( 23 – `3/4` ) = `7/6`
`x`(`92/4` – `3/4`) = `7/6`
`x` . `89/4` = `7/6`
`x` = `7/6` : `89/4`
`x` = `7/6` . `4/89`
`x` = `14/267`
`a) ( 3x+1) : ( -4) = -28`
`=> 3x +1 = 112`
`=> 3x = 111`
`=> x = 37`
`b) x – 49 = 5/18`
`=> x = 49 + 5/18`
`=> x = 887/18`
`c) 23x – 3/4.x = 1\frac{1}{6}`
`=> x( 23 – 3/4 ) = 7/6`
`=> x . 89/4 = 7/6`
`=> x = 14/267`