tìm số nguyên x biết 225 - ( 7-x ) = -5-(-14) -(x+32) + (-46)=-84

`225 - ( 7 - x ) = -5 - ( -14 )`

`225 - ( 7 - x ) = 9`

 `7 - x = 225 - 9`

`7 - x = 216`

 `x = 7 - 216`

 `x = -209`

Vậy `x = -209`

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`-( x + 32 ) + ( -46 ) = -84`

 `-x - 32 - 46 = -84`

  `-x - 78 = -84`

  `-x = -84 + 78`

   `-x = 6`

Vậy `x = 6`

$\text{#lknhatminh0322}$

a) ` 225 - ( 7 - x ) = -5 - ( -14 ) `

` 225 - 7 + x = -5 + 14 `

` 218 + x = 9 `

` x = 9 - 218 `

` x = -209 `

Vậy ` x = -209 `

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b) ` - ( x + 32 ) + ( -46 ) = -84 `

` -x - 32 - 46 = - 84 `

` -x - ( 32 + 46 ) = -84 `

` -x - 78 = -84 `

` -x = -84 + 78 `

` -x = -6 `

` x = 6 `

Vậy ` x = 6 `