Đáp án:
↓↓
Giải thích các bước giải:
`a )`
`58 + 7x = 100`
`7x = 100 - 58`
`7x = 42`
`x = 42 : 7`
`x = 6`
Vậy `x = 6`
`b )`
`101 + ( 36 - 4x ) = 105`
`36 - 4x = 105 - 101`
`36 - 4x = 4`
`4x = 36 - 4`
`4x = 32`
`x = 32 : 4`
`x = 8`
Vậy `x = 8`
`c )`
`3x - 7 = 28`
`3x = 28 + 7`
`3x = 35`
`x = 35 : 3`
`x = 35/3`
Vậy `x = 35/3`
`d )`
`(x - 12 ) : 12 = 12`
`x - 12 = 12 . 12`
`x - 12 = 144`
`x = 144 + 12`
`x = 156`
Vậy `x = 156`
`e ) `
`x - 56 : 4 = 16`
`x - 16 = 16`
`x = 16 + 16`
`x = 32`
Vậy `x = 32`
`f )`
`( 3x - 24 ) . 73 = 2 . 74`
`( 3x - 24) . 73 = 148`
`3x - 24 = 148 : 73`
`3x - 24 = 148/73`
`3x = 148/73 + 24`
`3x = 1900/73`
`x = 1900/73 : 3`
`x = 1900/219`
Vậy `x = 1900/219`